JPS63158478A - Apparatus for measuring dynamic characteristic of magnetoresistance effect element - Google Patents
Apparatus for measuring dynamic characteristic of magnetoresistance effect elementInfo
- Publication number
- JPS63158478A JPS63158478A JP61307292A JP30729286A JPS63158478A JP S63158478 A JPS63158478 A JP S63158478A JP 61307292 A JP61307292 A JP 61307292A JP 30729286 A JP30729286 A JP 30729286A JP S63158478 A JPS63158478 A JP S63158478A
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- Prior art keywords
- signal
- signal generator
- bias
- magnetic field
- signals
- Prior art date
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Links
- 230000000694 effects Effects 0.000 title description 2
- 230000005284 excitation Effects 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 230000008929 regeneration Effects 0.000 abstract 2
- 238000011069 regeneration method Methods 0.000 abstract 2
- 244000126211 Hericium coralloides Species 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000000284 extract Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000000329 molecular dynamics simulation Methods 0.000 description 2
- 101100018589 Penicillium roqueforti (strain FM164) ifgI gene Proteins 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
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- Measuring Magnetic Variables (AREA)
- Hall/Mr Elements (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的１
（産業上の利用分野）
この発明は磁気抵抗効果素子（以下ＭＲ素子と称する）
の動特性を測定する装置に係り、特にＭＲ素子を用いた
磁気ヘッド等の動特性を調べ最適使用条件等を求めるの
に適した磁気抵抗素子素・子の動特性測定装置に関する
。[Detailed Description of the Invention] [Objective of the Invention 1 (Field of Industrial Application) This invention relates to a magnetoresistive element (hereinafter referred to as an MR element).
The present invention relates to a device for measuring the dynamic characteristics of a magnetoresistive element, and more particularly to a device for measuring the dynamic characteristics of a magnetoresistive element/element, which is suitable for investigating the dynamic characteristics of a magnetic head using an MR element and determining optimal usage conditions.
（従来の技術）
従来からＭＲ素子を用いた磁気ヘッド等の動特性を調べ
最適使用条件等を求める際には次のような方法でその測
定が行なわれていた。(Prior Art) Conventionally, the following method has been used to examine the dynamic characteristics of a magnetic head using an MR element and to determine optimal operating conditions.
すなわち第１０図に示すように、第１の信号発生器１で
発生した信号ｆＳを記録アンプ２、記録ヘッド３により
磁気記録媒体４に記録し、この記録された信号を定電流
源５で駆動されている被測定対象のＭ Ｒｉ子６により
再生し再生アンプ７で増幅し、その基本波成分である信
号ｆ、あるいは２次Ｂ調波成分である信＠２ｆ を通過
させる帯域通過フィルタ８ａ、８ｂを通し得られた出力
信号Ｖ ＋ （ｆ ） アルイハＶ ２ （２ｆ
ｓ ） ｔｒｍ定するもので、第２の信号発生器９で発
生したバイアス信号ｆ、を駆動アンプ１０を通じて磁気
コア１１と巻線１２からなる励磁素子１３に入力しＭＲ
素子６のバイアス磁界を発生させ、これによってＭＲ素
子６の動特性を測定するものである。That is, as shown in FIG. 10, a signal fS generated by a first signal generator 1 is recorded on a magnetic recording medium 4 by a recording amplifier 2 and a recording head 3, and this recorded signal is driven by a constant current source 5. A bandpass filter 8a that passes the signal f, which is the fundamental wave component, or the signal @2f, which is the second-order B harmonic component, which is reproduced by the M Ri element 6 of the object to be measured and amplified by the reproduction amplifier 7; The output signal V + (f) obtained through 8b is the output signal V 2 (2f
s) trm, the bias signal f generated by the second signal generator 9 is inputted to the excitation element 13 consisting of the magnetic core 11 and the winding 12 through the drive amplifier 10, and the MR
A bias magnetic field is generated for the element 6, and the dynamic characteristics of the MR element 6 are thereby measured.
第１１図はこの測定装置によって得られたバイアス特性
図でありこの図からＭＲ水素子最適バイアスとしてＶ□
０を選択することができる。従来はこのようにＭＲ水素
子動特性を測定するためには、磁気記録媒体４とこれに
信号を記録するための記録ヘッド３等が必要であり、更
にＭＲ素子６は実際のヘッド形状に成形して磁気記録媒
体とのインターフェイスを完全なものにしておく必要が
あった。また励磁素子１３より発生するバイアス磁界で
磁気記録媒体上の信号で、が影響を受けない範囲（〜■
□□８）でしかバイアス特性を測定することができなか
った。Figure 11 is a bias characteristic diagram obtained by this measuring device, and from this diagram, the optimum bias for MR hydrogen atoms is V□
0 can be selected. Conventionally, in order to measure the MR hydrogen dynamic characteristics in this way, a magnetic recording medium 4 and a recording head 3 for recording signals on the magnetic recording medium 4 are required, and the MR element 6 is also molded into the shape of the actual head. It was necessary to perfect the interface with magnetic recording media. In addition, the bias magnetic field generated by the excitation element 13 does not affect the signal on the magnetic recording medium (~■
The bias characteristics could only be measured with □□8).
（発明が解決しようとする問題点）
上述したように従来のＭＲ水素子動特性の測定方法では
、磁気記録媒体４とこれに信号を記録するための記録ヘ
ッド３等が必要であり、更にＭＲ素子６は実際のヘッド
形状に成形して磁気記録媒体とのインターフェイスを完
全なものにしておく必要があるという問題があった。こ
のためヘッド形状に成形したＭＲ索子６と磁気記録媒体
４のインターフェイスをとることが難しく多くの時間と
熟練度を必要とするという問題があった。(Problems to be Solved by the Invention) As described above, the conventional method for measuring MR hydrogen molecular dynamics requires a magnetic recording medium 4 and a recording head 3 for recording signals on the magnetic recording medium 4. There is a problem in that the element 6 needs to be molded into the shape of the actual head to ensure a perfect interface with the magnetic recording medium. For this reason, there is a problem in that it is difficult to create an interface between the MR probe 6 molded into the shape of a head and the magnetic recording medium 4, requiring a lot of time and skill.
また励磁素子１３より発生するバイアス磁界で磁気記録
媒体４上の信号ｆ８が影響を受けない範囲（〜■□Ｉａ
ｘ）でしかバイアス特性を測定することができず、この
ため磁気記録媒体の保磁力との関係で測定可能なバイア
ス磁界の範囲が制限されてしまうという問題があった。Also, the range in which the signal f8 on the magnetic recording medium 4 is not affected by the bias magnetic field generated by the excitation element 13 (~■□Ia
There is a problem in that the bias characteristics can only be measured with x), and therefore the range of the bias magnetic field that can be measured is limited in relation to the coercive force of the magnetic recording medium.
［発明の構成］
（問題を解決するための手段）
本発明の磁気抵抗効果素子の動特性測定装置は、複数の
信号を発生する信号発生器と、磁界を発生させる励磁素
子とこの励磁素子に前記信号発生器の信号を励磁信号と
して供給する駆動アンプを備えた励磁部と、被測定物で
ある磁気抵抗効果素子とこの素子に一定の電流を供給す
る定電流源と磁気抵抗素子で発生した信号を増幅する再
生アンプと上記信号発生器の一つの信号の基本波成分あ
るいはその偶数次高調波成分を取出す帯域通過フィルタ
を具備し、上記バイアス磁界を発生させる励磁素子に磁
気記録媒体上の信号に見合う信号を重畳させることによ
り、ＭＲ水素子動特性を容易に測定できるようにしたも
のである。[Structure of the Invention] (Means for Solving the Problem) A dynamic characteristic measuring device for a magnetoresistive element according to the present invention includes a signal generator that generates a plurality of signals, an excitation element that generates a magnetic field, and an excitation element that generates a magnetic field. An excitation unit includes a drive amplifier that supplies the signal from the signal generator as an excitation signal, a magnetoresistive element that is the object to be measured, a constant current source that supplies a constant current to this element, and the magnetoresistive element. It is equipped with a reproducing amplifier that amplifies the signal and a bandpass filter that extracts the fundamental wave component or its even harmonic components of one signal of the signal generator, and the excitation element that generates the bias magnetic field receives the signal on the magnetic recording medium. By superimposing signals corresponding to the above, the MR hydrogen molecular dynamic characteristics can be easily measured.
（作用）
複数の信号発生器から発生する信号のうち、例えば第１
の信号を磁気記録媒体上の信号に相当する比較的小さい
レベルにし、第２の信号を第１の信号に比べて充分低い
周波数のバイアス信号とし、この２つの信号をｆ［して
励磁素子に加えることにより、バイアス信号の変化につ
れてＭＲ水素子両端には各バイアス点でのその抵抗変化
分が第１の信号の基本波成分の大きざとして現れ、その
抵抗変化分の直線性が偶数次高調波として現れる。(Function) Among the signals generated from a plurality of signal generators, for example, the first
The signal is set to a relatively small level corresponding to the signal on the magnetic recording medium, the second signal is set as a bias signal with a frequency sufficiently lower than that of the first signal, and these two signals are sent to the excitation element using f[. By adding this, as the bias signal changes, the resistance change at each bias point appears at both ends of the MR hydrogen element as the magnitude of the fundamental wave component of the first signal, and the linearity of the resistance change appears as an even-order harmonic. Appears as a wave.
（実施例） 以下本発明の実施例を図面参照して説明づる。(Example) Embodiments of the present invention will be described below with reference to the drawings.
なお以下の説明する図において第１０図と対応する部分
には同一符号を付し重複する説明は省略する。In the figures described below, parts corresponding to those in FIG. 10 are designated by the same reference numerals, and redundant explanations will be omitted.
第１図は本発明の第１の実施例の構成図である。FIG. 1 is a block diagram of a first embodiment of the present invention.
この実施例ではまず第１の信号発生器１によって周波数
ｆＳの櫛歯状波の信号を発生させ、第２の信号発生器９
によって周波数ｆ、のバイアス信号を発生させる。この
２つの信号を重畳させて駆動アンプ１０により、励磁素
子１３を駆動し、被測定ＭＲ素子６を励磁する。ＭＲ素
子６には定電流源５より一定の電流が流れており、ＭＲ
素子６の抵抗変化が電圧として再生アンプ７に加えられ
、再生出力Ｖ。ｕｔが得られる。第１および第２の信号
に第２図に示すような比較的小さい正弦波および第１の
信号周波数に比べ充分低い周波数のランプ信号をそれぞ
れ用いることにより、ＭＲ素子６の抵抗変化２ΔＲを縦
軸、バイアス磁界に相当する電圧■１を横軸にとった第
２図に示すように、ＭＲ素子６の再生出力ｖ′ が得
られる。In this embodiment, the first signal generator 1 first generates a comb-shaped wave signal of frequency fS, and the second signal generator 9
A bias signal of frequency f is generated by. These two signals are superimposed and the drive amplifier 10 drives the excitation element 13 to excite the MR element 6 to be measured. A constant current flows through the MR element 6 from the constant current source 5, and the MR element 6
The resistance change of the element 6 is applied as a voltage to the reproduction amplifier 7, and the reproduction output V is obtained. ut is obtained. By using a relatively small sine wave as shown in FIG. 2 and a ramp signal with a sufficiently lower frequency than the first signal frequency as the first and second signals, the resistance change 2ΔR of the MR element 6 is expressed on the vertical axis. , the reproduction output v' of the MR element 6 is obtained as shown in FIG. 2, in which the horizontal axis is the voltage 1 corresponding to the bias magnetic field.
ｕｔ
そして再生アンプ７により増幅された再生出力Ｖｏｕｔ
を、第１の信号周波数の基本波成分を取出す帯域通過フ
ィルタ８ａおよびその２次高調波成分を取出す帯域通過
フィルタ８ｂに通しｖｌ（ｆ ）およびＶ２ （２
ｆｓ ）が得られる。ut and the playback output Vout amplified by the playback amplifier 7
is passed through a band-pass filter 8a that extracts the fundamental wave component of the first signal frequency and a band-pass filter 8b that extracts its second harmonic component.
fs) is obtained.
この２つの信号Ｖ＋ （ｆ ）、Ｖ２ （２ｆ、
）および励磁部１のバイアス信号を発生する第２の信号
発生器９から得られるバイアス磁界に比例する電圧■Ｉ
Ｉを用いて例えばオシロスコープのＹｌ、Ｙ２およびＸ
軸に入力することにより第３図に示すバイアス特性が得
られる。これは従来技術によって得られた第１１図に示
した動特性であるバイアス特性と同等の結果である。し
かも励磁範囲を第１１図の励磁素子１３より発生するバ
イアス磁界で磁気記録媒体上の信号ｆ、が影響を受けな
い範囲ｖｌｌｌａＸを越えた範囲まで測定ができるよう
になる。These two signals V+ (f), V2 (2f,
) and a voltage proportional to the bias magnetic field obtained from the second signal generator 9 that generates the bias signal for the excitation section 1 ■I
For example, Yl, Y2 and X of the oscilloscope using I
By inputting to the axis, the bias characteristics shown in FIG. 3 can be obtained. This result is equivalent to the bias characteristic, which is the dynamic characteristic shown in FIG. 11, obtained by the prior art. Moreover, the excitation range can be measured beyond the range vlllaX in which the signal f on the magnetic recording medium is not affected by the bias magnetic field generated by the excitation element 13 shown in FIG.
このようにこの実施例によれば磁気記録媒体４やＭＲ素
子６のヘッド化および磁気記録媒体とのインターフェイ
スを考慮することなく容易にＭ Ｉｔ索子６の動特性が
得られ、またバイアスを適当なところ（例えば最適バイ
アスＶＨｏ）に定め信号ｆＳのレベルを変えることによ
り、信号周波数ｆ、の入力特性も得られる。As described above, according to this embodiment, the dynamic characteristics of the M It probe 6 can be easily obtained without considering the head configuration of the magnetic recording medium 4 or the MR element 6, and the interface with the magnetic recording medium, and the bias can be adjusted appropriately. By changing the level of the signal fS at a certain point (for example, the optimum bias VHo), the input characteristic of the signal frequency f can also be obtained.
第４図および第５図は、それぞれ本発明の第２および第
３の実施例の構成を示すもので、第１図の実施例の励磁
部を２つに分割したものである。4 and 5 show the configurations of second and third embodiments of the present invention, respectively, in which the excitation section of the embodiment of FIG. 1 is divided into two.
第４図に示した第２の実施例はバイアス信号の励磁を第
１図と同じ励磁素子１３ｂで行ない、第１の信号発生器
１からの信号の励磁をリング型の磁気コア１１ａと駆動
巻線１２ａとからなる励磁素子１３ａで行なうように構
成されている。この実施例では信ｆ３ｆ、の励磁にリン
グ型の磁気コア１１ａを有する励磁素子１３ａを用いる
ことにより信号ｆ の磁界をＭＲ素子６の使用条件に合
せＭＲ素子の磁界のベクトルに依存した特性をも測定す
ることができる。In the second embodiment shown in FIG. 4, the bias signal is excited by the same excitation element 13b as in FIG. 1, and the signal from the first signal generator 1 is excited by a ring-shaped magnetic core 11a and a driving The excitation element 13a consisting of a wire 12a is configured to perform the excitation. In this embodiment, an excitation element 13a having a ring-shaped magnetic core 11a is used to excite the signal f3f, so that the magnetic field of the signal f is adjusted to the operating conditions of the MR element 6, and characteristics that depend on the vector of the magnetic field of the MR element are obtained. can be measured.
第５図に示した第３の実施例は、第２の実施例の考え方
と同様に信号ｆ、の励磁に第６図に示したストライプパ
ターン１４を用い、導線１５のまわりに発生する磁界が
長さλ／２毎に反転することを利用して磁界の反−転周
期λに依存したＭＲ素子６の特性を測定できるように構
成されている。第６図に示したストライブパターン１４
は等間隔のものである必要はなく長さλを連続的に変え
ることによりλをパラメータにしたＭＲ素子６の動特性
を得ることができる。In the third embodiment shown in FIG. 5, the stripe pattern 14 shown in FIG. The structure is such that the characteristics of the MR element 6 depending on the reversal period λ of the magnetic field can be measured by utilizing the reversal every length λ/2. Strive pattern 14 shown in FIG.
do not need to be equally spaced, and by continuously changing the length λ, it is possible to obtain the dynamic characteristics of the MR element 6 using λ as a parameter.
第７図および第８図は励磁素子１３によって発生する磁
界の検出方払を異にした他の実施例の要部を示したもの
である。7 and 8 show the main parts of another embodiment in which the method of detecting the magnetic field generated by the excitation element 13 is different.
第７図に示した実施例は励磁素子１３の発生磁界が励磁
巻線６に流れる電流に比例する場合の実施例であり、こ
の回路に抵抗器１６を挿入して端子間電圧を測定するこ
とにより磁界を検出するように構成したものであり、ま
た第８図に示した実施例は実際に発生した磁界をホール
素子１７により正確に検出するように構成したものであ
る。The embodiment shown in FIG. 7 is an embodiment in which the magnetic field generated by the excitation element 13 is proportional to the current flowing through the excitation winding 6, and a resistor 16 is inserted into this circuit to measure the voltage between the terminals. The embodiment shown in FIG. 8 is constructed so that the actually generated magnetic field is accurately detected by the Hall element 17.
なお上記した励磁および磁界の検出には他の方法、例え
ばｉｆｇＩ！素子やＭＲ素子を用いる方法などを用いる
ことも可能である。Note that there are other methods for excitation and magnetic field detection described above, such as ifgI! It is also possible to use a method using an element or an MR element.
第９図は本発明の第４の実施例の構成図である。FIG. 9 is a block diagram of a fourth embodiment of the present invention.
この実施例では第１図に示した第１の実施例の第１およ
び第２の信号発生器１．９に更に第３の信号発生器１８
を備え、また帯域通過フィルタとして第１の信号周波数
ｆ、１の整数倍（ｎｌ）と第３の信号周波数ｒ、２の整
数倍（ｎｌ）の和と差の周波数（ｎ１ｆ Ｉ±ｎ２ｆ
、２ ）を通過さＵる帯域通過フィルタ８Ｃを備えるこ
とにより、２つの信号（ｆ Ｉ、ｆｓ２）の混変調を
調べるこＳ 。In this embodiment, a third signal generator 18 is added to the first and second signal generators 1.9 of the first embodiment shown in FIG.
and as a bandpass filter, the sum and difference frequencies (n1f I±n2f) of the first signal frequency f, an integral multiple of 1 (nl) and the third signal frequency r, an integral multiple of 2 (nl)
.
とをも可能としたものである。This also makes it possible.
［発明の効果］
以上述べたように本発明の磁気抵抗効果素子の動特性測
定装置は、従来の磁気記録媒体の使用に代えて、バイア
ス磁界を発生させる励磁素子に従来の磁気記録媒体に記
録された信号に見合った信号をｍ畳させるようにしたの
で、磁気記録媒体とこれに信号を記録するための記録ヘ
ッド等が不要となり、任意の形状でＭＲ素子の動的特性
の測定を行なうことができ、またＭＲ索子と磁気記録媒
体のインターフェイスをとる必要もない。さらに励磁素
子より発生するバイアス磁界で磁気記録媒体上の信号ｆ
が影響を受けない範囲（〜Ｖ□ｌａＸ ）を越えてバ
イアス特性を測定することができるようになり、最適バ
イアス点の設定などを短時聞で行なうことが可能となる
。[Effects of the Invention] As described above, the device for measuring dynamic characteristics of a magnetoresistive element of the present invention uses an excitation element that generates a bias magnetic field to record information on a conventional magnetic recording medium, instead of using a conventional magnetic recording medium. Since the signal corresponding to the received signal is made to be m squared, there is no need for a magnetic recording medium and a recording head for recording signals on it, and the dynamic characteristics of the MR element can be measured in any shape. Moreover, there is no need for an interface between the MR probe and the magnetic recording medium. Furthermore, the bias magnetic field generated by the excitation element causes the signal f on the magnetic recording medium to be
It becomes possible to measure the bias characteristics beyond the range (~V□laX) in which the voltage is not affected, and it becomes possible to set the optimum bias point in a short time.
第１図は本発明の第１の実施例の構成図、第２図は本発
明の測定装置の動作を説明するための原理図、第３図は
本発明の測定装置によって得られたバイアス特性図、第
４図および第５図は本発明の第２および第３の実施例の
構成図、第６図は第３の実施例に使用するストライブパ
ターンを示す斜視図、第７図および第８図は本発明の励
１１Ａ子の発生磁界を検出する方法を示す構成図、第９
図は本発明の第４の実施例の構成図、第１０図は従来の
磁気抵抗効果素子の動特性測定装置の構成図、第１１図
は従来の測定装置によって得られたバイアス特性図であ
る。
１・・・・・・第１の信号発生器
２・・・・・・第２の信号発生器
５・・・・・・定電流源
６・・・・・・ＭＲ素子
７・・・・・・再生アンプ
８ａ、 ８ｂ、 ８ｃ・・・・・・帯域通過フィルタ１
０．１０ａ、１０ｂ
・・・・・・駆動アンプ
１１．１１ａ、１１ｂ・・・・・・磁気コア１２．１２
ａ、１２ｂ・・・・・・駆動巻線１３・・・・・・励磁
素子
１４・・・・・・ストライプパターン
１５・・・・・・導体
１６・・・・・・抵抗器
１７・・・・・・ホール素子Fig. 1 is a configuration diagram of the first embodiment of the present invention, Fig. 2 is a principle diagram for explaining the operation of the measuring device of the present invention, and Fig. 3 is a bias characteristic obtained by the measuring device of the present invention. 4 and 5 are block diagrams of second and third embodiments of the present invention, FIG. 6 is a perspective view showing a stripe pattern used in the third embodiment, and FIGS. Fig. 8 is a block diagram showing a method for detecting the magnetic field generated by the exciter 11A of the present invention, and Fig. 9
The figure is a block diagram of a fourth embodiment of the present invention, FIG. 10 is a block diagram of a conventional dynamic characteristic measuring device for a magnetoresistive element, and FIG. 11 is a diagram of bias characteristics obtained by the conventional measuring device. . 1...First signal generator 2...Second signal generator 5...Constant current source 6...MR element 7... ...Reproduction amplifier 8a, 8b, 8c...Band pass filter 1
0.10a, 10b...Drive amplifier 11.11a, 11b...Magnetic core 12.12
a, 12b... Drive winding 13... Exciting element 14... Stripe pattern 15... Conductor 16... Resistor 17... ····Hall element
Claims (4)
ある磁気抵抗効果素子の近傍に磁界を発生させる励磁素
子と、この励磁素子に前記信号発生器の信号を励磁信号
として供給する駆動アンプと、前記磁気抵抗効果素子に
定電流を供給する定電流源と、前記磁気抵抗素子で発生
した信号を増幅する再生アンプと、この信号発生器の一
つの信号の基本波成分、その偶数次高調波成分またはこ
れらの合成波成分を取出す帯域通過フィルタとを具備し
たことを特徴とする磁気抵抗効果素子の動特性測定装置
。(1) A signal generator that generates a plurality of signals, an excitation element that generates a magnetic field near the magnetoresistive element that is the object to be measured, and a signal from the signal generator that supplies the excitation element to the excitation element. a driving amplifier, a constant current source that supplies a constant current to the magnetoresistive element, a reproducing amplifier that amplifies the signal generated by the magnetoresistive element, and a fundamental wave component of one signal of this signal generator, its even number. 1. An apparatus for measuring dynamic characteristics of a magnetoresistive element, comprising a bandpass filter for extracting harmonic components or composite wave components thereof.
めの磁界検出素子を備えた特許請求の範囲第１項記載の
磁気抵抗効果素子の動特性測定装置。(2) An apparatus for measuring dynamic characteristics of a magnetoresistive element according to claim 1, comprising a magnetic field detection element for detecting the strength of the magnetic field generated by the excitation section.
器を備え、前記帯域通過フィルタが第１および第３の信
号周波数の整数倍の和と差の信号を通過させる帯域通過
フィルタである特許請求の範囲第１項または第２項記載
の磁気抵抗効果素子の動特性測定装置。(3) A bandpass filter comprising a signal generator that generates first, second, and third signals, wherein the bandpass filter passes signals of sums and differences of integral multiples of the first and third signal frequencies. An apparatus for measuring dynamic characteristics of a magnetoresistive element according to claim 1 or 2.
発生器の信号波形が櫛歯状波の信号である特許請求の範
囲第１項ないし第３項のいずれか１項記載の磁気抵抗効
果素子の動特性測定装置。(4) The magnetoresistive element according to any one of claims 1 to 3, wherein in the signal generator, the signal waveform of at least one signal generator is a comb-shaped wave signal. Dynamic property measurement device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61307292A JPS63158478A (en) | 1986-12-23 | 1986-12-23 | Apparatus for measuring dynamic characteristic of magnetoresistance effect element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61307292A JPS63158478A (en) | 1986-12-23 | 1986-12-23 | Apparatus for measuring dynamic characteristic of magnetoresistance effect element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63158478A true JPS63158478A (en) | 1988-07-01 |
Family
ID=17967375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61307292A Pending JPS63158478A (en) | 1986-12-23 | 1986-12-23 | Apparatus for measuring dynamic characteristic of magnetoresistance effect element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63158478A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721488A (en) * | 1995-01-06 | 1998-02-24 | Tdk Corporation | Method and apparatus for testing integrated magnetic head assembly |
| US6538430B2 (en) | 2001-08-23 | 2003-03-25 | International Business Machines Corporation | Screening test for transverse magnetic-field excited noise in giant magnetoresistive heads |
-
1986
- 1986-12-23 JP JP61307292A patent/JPS63158478A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5721488A (en) * | 1995-01-06 | 1998-02-24 | Tdk Corporation | Method and apparatus for testing integrated magnetic head assembly |
| US6538430B2 (en) | 2001-08-23 | 2003-03-25 | International Business Machines Corporation | Screening test for transverse magnetic-field excited noise in giant magnetoresistive heads |
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