公开(公告)号：US09354285B2

公开(公告)日：2016-05-31

申请号：US14374786

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12 ,  G01R33/10

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: A magnetic measurement device which measures coercivity and coercivity distribution in a microregion of a thin plate magnetic sample with high coercivity. A magnetic sample is applied with a magnetic field in a first direction and magnetized, a second magnetic field is applied in a direction opposite to the first, a measuring part scans the sample, measuring magnetic flux leakage due to remnant magnetization in the sample. The intensity of the second magnetic field is gradually increased while the measuring part repeats the measurement to obtain the second magnetic field wherein the magnitude of the leakage from the sample reaches the maximum level, and when a magnetic field equivalent to the coercivity is applied to the sample and about half of the magnetization is reversed, the sample's coercivity is obtained based on the determination that the demagnetizing field Hd reaches the minimum level and the leakage reaches the maximum level.

Abstract translation: 一种磁测量装置，其测量具有高矫顽力的薄板磁性样品的微区域中的矫顽力和矫顽力分布。 磁性样品沿第一方向施加磁场并被磁化，在与第一方向相反的方向上施加第二磁场，测量部分扫描样品，测量样品中残留磁化的磁通量泄漏。 第二磁场的强度逐渐增加，而测量部分重复测量以获得第二磁场，其中来自样品的泄漏的大小达到最大电平，并且当将等于矫顽力的磁场施加到 样品中约一半的磁化反转，基于去磁场Hd达到最小值并且漏电达到最大值的确定获得样品的矫顽力。

公开(公告)号：US09702945B2

公开(公告)日：2017-07-11

申请号：US14374640

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12 ,  G01R33/10

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: A magnetic measurement device which can measure the magnetic characteristics in a microregion of a thin plate magnetic sample. After a magnetic sample is applied by a magnetic field and magnetized accordingly, by scanning the magnetic sample using a measuring part, the magnetic flux leakage in the magnetic sample can be measured. The magnetic flux leaks outside by magnetizing a first region and a second region of the magnetic sample in reciprocally opposite directions and reducing the demagnetizing field. Specifically, a magnetic field generating part with at least a pair of magnetic poles is used to perform the magnetization of multiple poles, or the magnetic field generating part applies a damped oscillation magnetic field to perform the magnetization, or a local magnetic field generating part which applies an alternating magnetic field and scans the surface of the sample at the same time is used to perform the magnetization.

公开(公告)号：US20150070005A1

公开(公告)日：2015-03-12

申请号：US14374786

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: A magnetic measurement device which measures coercivity and coercivity distribution in a microregion of a thin plate magnetic sample with high coercivity. A magnetic sample is applied with a magnetic field in a first direction and magnetized, a second magnetic field is applied in a direction opposite to the first, a measuring part scans the sample, measuring magnetic flux leakage due to remnant magnetization in the sample. The intensity of the second magnetic field is gradually increased while the measuring part repeats the measurement to obtain the second magnetic field wherein the magnitude of the leakage from the sample reaches the maximum level, and when a magnetic field equivalent to the coercivity is applied to the sample and about half of the magnetization is reversed, the sample's coercivity is obtained based on the determination that the demagnetizing field Hd reaches the minimum level and the leakage reaches the maximum level.

Abstract translation: 一种磁测量装置，其测量具有高矫顽力的薄板磁性样品的微区域中的矫顽力和矫顽力分布。 磁性样品沿第一方向施加磁场并被磁化，在与第一方向相反的方向上施加第二磁场，测量部分扫描样品，测量样品中残留磁化的磁通量泄漏。 第二磁场的强度逐渐增加，而测量部分重复测量以获得第二磁场，其中来自样品的泄漏的大小达到最大电平，并且当将等于矫顽力的磁场施加到 样品中约一半的磁化反转，基于去磁场Hd达到最小值并且漏电达到最大值的确定获得样品的矫顽力。

公开(公告)号：US20140375308A1

公开(公告)日：2014-12-25

申请号：US14374640

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: A magnetic measurement device which can measure the magnetic characteristics in a microregion of a thin plate magnetic sample. After a magnetic sample is applied by a magnetic field and magnetized accordingly, by scanning the magnetic sample using a measuring part, the magnetic flux leakage in the magnetic sample can be measured. The magnetic flux leaks outside by magnetizing a first region and a second region of the magnetic sample in reciprocally opposite directions and reducing the demagnetizing field. Specifically, a magnetic field generating part with at least a pair of magnetic poles is used to perform the magnetization of multiple poles, or the magnetic field generating part applies a damped oscillation magnetic field to perform the magnetization, or a local magnetic field generating part which applies an alternating magnetic field and scans the surface of the sample at the same time is used to perform the magnetization.

Abstract translation: 一种能够测量薄板磁性样品的微区域中的磁特性的磁性测量装置。 在通过磁场施加磁性样品并相应地磁化后，通过使用测量部分扫描磁性样品，可以测量磁性样品中的磁通量泄漏。 通过使磁性样品的第一区域和第二区域沿相反的方向磁化并减小去磁场，使磁通量向外泄漏。 具体而言，使用具有至少一对磁极的磁场产生部来进行多极的磁化，或者磁场产生部施加阻尼振荡磁场来进行磁化，或者使用局部磁场产生部， 施加交变磁场并同时扫描样品的表面以用于执行磁化。