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公开(公告)号：US09947347B1
公开(公告)日：2018-04-17
申请号：US15385595
申请日：2016-12-20
发明人： Petrus Antonius Van Der Heijden , Quang Le , Kuok San Ho , Xiaoyong Liu , Gonçalo Marcos Baião De Albuquerque
CPC分类号： G11B5/372 , G01R33/075 , G11B5/1278 , G11B5/332 , G11B5/374 , H01J43/06
摘要： A magnetic sensor that generates a signal based on inverse spin Hall effect. The sensor includes a magnetic free layer and a non-magnetic, electrically conductive spin Hall layer located adjacent to the magnetic free layer. Circuitry is configured to supply an electrical current that travels through the magnetic free layer and the spin Hall layer in a direction that is generally perpendicular to the plane of the layers or perpendicular to a plane defined by an interface between the magnetic free layer and the spin Hall layer. The inverse spin Hall effect causes an electrical voltage in the spin Hall layer as a result of the current, and the voltage changes relative to the orientation of magnetization of the magnetic free layer. Circuitry is provided for measuring the voltage in the spin Hall layer in a direction that is generally perpendicular to the direction of the electrical current.
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公开(公告)号：US10388305B1
公开(公告)日：2019-08-20
申请号：US15919025
申请日：2018-03-12
发明人： Gonçalo Marcos Baião De Albuquerque , Yunfei Ding , Alexander Goncharov , Kuok San Ho , Daniele Mauri , Goran Mihajlovic , Suping Song , Petrus Antonius Van Der Heijden
摘要： Disclosed herein are apparatuses and methods for writing to a magnetic medium, and data storage devices comprising such apparatuses and methods. An apparatus comprises a main pole, a trailing shield, a write-field-enhancing structure, a write coil, a write current control circuit configured to supply a write current to the write coil to record a bit to a magnetic medium, and a driving current control circuit configured to supply a driving current to the write-field-enhancing structure, wherein the driving current comprises a driving pulse. A method of writing to a magnetic medium comprises supplying a write current to a write coil of a magnetic write head, and supplying a driving current to a free layer disposed in a write gap between a main pole and a trailing shield of the magnetic write head, wherein the driving current comprises an AC component.
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公开(公告)号：US10957346B2
公开(公告)日：2021-03-23
申请号：US16833650
申请日：2020-03-29
发明人： Gonçalo Marcos Baião De Albuquerque , Yunfei Ding , Alexander Goncharov , Kuok San Ho , Daniele Mauri , Goran Mihajlovic , Suping Song , Petrus Antonius Van Der Heijden
IPC分类号： G11B11/105 , G11B5/127 , G11B5/31 , G11B5/60 , G11B5/11 , G11B5/39 , G11B5/455 , G11B5/02 , G11B5/00
摘要： Disclosed herein are magnetic recording devices and methods of using them. A magnetic recording device comprises a main pole extending to an air-bearing surface (ABS), a trailing shield extending to the ABS, a write-field-enhancing structure disposed between and coupled to the main pole and the trailing shield at the ABS, a write coil configured to magnetize the main pole, a write current control circuit coupled to the write coil and configured to apply a write current to the write coil, wherein the write current comprises a write pulse, and a bias current control circuit coupled to the write-field-enhancing structure and configured to apply a bias current to the write-field-enhancing structure, wherein the bias current comprises a driving pulse offset in time from the write pulse by a delay, wherein the delay substantially coincides with an expected magnetization switch-time lag of a free layer of the write-field-enhancing structure.
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