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31. 发明专利

JP2001297403A METHOD AND DEVICE FOR IMPROVING PROPERTY OF THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JP2001297403A
公开(公告)日：2001-10-26
申请号：JP2000113569
申请日：2000-04-14
申请人： TDK CORP
发明人： HACHISUGA NOZOMI , TOMITA KATSUHIKO
IPC分类号： G11B5/09 , G11B5/02 , G11B5/465
摘要： PROBLEM TO BE SOLVED: To provide the novel method and device for improving the property of a thin film magnetic head capable of enhancing the property improvement so that the generation of pop-corn noise is surely eliminated or reduced. SOLUTION: The noise generated in the reading signal after the writing operation, is suppressed or reduced by impressing the external alternating magnetic field on the composite thin film magnetic head while making the writing current flow into an inductive write-in head element of the composite thin film magnetic head which is provided with the inductive write-in head element and an MR read-out head element.

32. 发明专利

JPH10269537A METHOD AND DEVICE FOR INSPECTING MAGNETIC HEAD HAVING SPIN BULB MAGNETO-RESISTANCE ELEMENT 失效
公开(公告)号：JPH10269537A
公开(公告)日：1998-10-09
申请号：JP8555697
申请日：1997-03-21
申请人： TDK CORP
发明人： INAGE KENJI , HACHISUGA NOZOMI , SAKAI MASANORI
IPC分类号： G11B5/00 , G11B5/31 , G11B5/39 , G11B5/455
摘要： PROBLEM TO BE SOLVED: To easily and surely detect a pinned direction by obtaining the ρ-H loop characteristic of a spin bulb magneto-resistance MR element from the detected output voltage in the condition in which an alternating magnetic field is applied in the magnetization direction of a pinned layer. SOLUTION: When the polarization of the inclination of an expected ρ-H loop is set as positive, a prescribed sense current is applied to the spin bulb MR element of a bar 44 on a table 43a through a probe pin 45 from a constant current source 50. Then, the driving current having a prescribed frequency is supplied to a coil 40 from a Helmholtz power supply 41 and the magnetic field being generated is applied in the longitudinal axis direction of the bar 44. At that time, the waveforms of the output voltage of the spin bulb MR element, i.e., the ρ-H loop are taken in for a number of times at a prescribed time interval, A/D converted and recorded as data. Then, a control computer 42 computes the positive or the negative of the inclination of the loop and the number of waveform data are counted for a positive and a negative. If the number of positive inclinations is larger than the negative, the pinned direction is discriminated as normal.

33. 发明专利

JP2000222713A METHOD AND DEVICE FOR INSPECTING COMBINED MAGNETIC HEAD 失效
公开(公告)号：JP2000222713A
公开(公告)日：2000-08-11
申请号：JP2013599
申请日：1999-01-28
申请人： TDK CORP
发明人： HACHISUGA NOZOMI , INAGE KENJI , MAEDA TOSHIAKI
IPC分类号： G11B5/39 , G11B5/00 , G11B5/31 , G11B5/455
摘要： PROBLEM TO BE SOLVED: To easily and surely inspect the unstability of output around a bias point by applying a current to an inductive element without impressing the magnetic field on a magnetic head from the outside and measuring the output characteristic of an MR element after the application of this current is finished. SOLUTION: A sense current is applied to the MR element by aligning the output terminal of the MR element of the magnetic head to be inspected and a 1st probe pin 12a and aligning the input terminal of the inductive element and a 2nd probe pin 12b. Next, after the supply of a rectangular current to the inductive element of the head to be inspected is finished, a voltage from the output terminal of the MR element is detected in the state in which the sense current is applied, and is subjected to A/D conversion to fetch as data. These data are analyzed by a control computer 20 to calculate the standard deviation, the maximum value and the minimum value, etc., of the output voltage, and by these obtained values, the decision of the normal/defective article is made in accordance with the existence of the unstability of the output of this magnetic head.

34. 发明专利

JPH11259828A MAGNETIZATION DIRECTION MEASURING METHOD AND DEVICE FOR MAGNETORESISTIVE EFFECT ELEMENT 失效
公开(公告)号：JPH11259828A
公开(公告)日：1999-09-24
申请号：JP7855098
申请日：1998-03-12
申请人： TDK CORP
发明人： SHIMAZAWA KOJI , HACHISUGA NOZOMI , OTA MANABU , SASAKI TETSUO , ARAKI SATORU
IPC分类号： G11B5/39 , G01R33/09 , G11B5/00 , G11B5/455
摘要： PROBLEM TO BE SOLVED: To correctly and highly accurately measure the pinned direction of a magneto resistive effect element by calculating maximum values of resistances of the element in areas in which polarities of a magnetic field for measurement are positive and negative while impressing the magnetic field for measurement on the element and calculating the relative rotational angle with respect to the magnetic field for measurement at the time the maximum values become roughly equal while relatively rotating the impression direction of the magnetic field untill the maximum values becomes roughly equal each other. SOLUTION: A computer 22 performs positioning between the output terminals of a spin valve stacked matter to be inspected of a sample 26 and a probe pin 27 by moving or rotating X-Y-Z and θ tables 23, 24. Next, the computer 22 calculates maximum values Rmp, Rmn in areas in which polarities of the magnetic field for measurement are positive and negative by a peak detecting method of the like while making sense current to flow through the spin valve stacked matter and by impressing the magnetic field for measurement whose polarities are periodically changed with a Helmholz's coil 20 on the sample 26. Then, it calculates an angle in which the maxumum values Rmp, Rmn become roughly equal by rotating the θ table 24 in a direction in which the difference of the maximum values Rmp, Rmn becomes smaller.

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