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US Patent 11621111 Strategies to perform magnetization reversals in ferromagnets

Patent 11621111 was granted and assigned to Northwestern University on April, 2023 by the United States Patent and Trademark Office.

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Is a
Patent
Patent
1

Patent attributes

Patent Applicant
Northwestern University
Northwestern University
1
Current Assignee
Northwestern University
Northwestern University
1
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
116211111
Patent Inventor Names
Zhaohui Zhang1
John B. Ketterson1
Jinho Lim1
Anupam K. Garg1
Date of Patent
April 4, 2023
1
Patent Application Number
174834051
Date Filed
September 23, 2021
1
Patent Primary Examiner
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Bryan R Perez
1
CPC Code
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G01R 33/445
1
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G01R 33/093
1
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G01R 33/60
1
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G01R 33/3802
1
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G01R 33/3808
1
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G01R 33/56
1
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G11C 11/161
1
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G01R 33/54
1
...

Systems and methods for reversing a magnetization in a ferromagnet include a nanometer-scale cylindrical ferromagnetic sample having a height to diameter aspect ratio on the order of 2 or greater. A temporally-varying external field comprising an r.f. Pi pulse is applied to the ferromagnetic sample to cause a precession magnetization vector inclined at an angle with respect to the longest axis of the ferromagnetic sample to continuously rotate around the longest axis. One or more parameters of the temporally-varying external field is continuously adjusted based on at least magnetization dynamics of the ferromagnetic sample and/or an angular dependence of a precession frequency of the ferromagnetic sample.

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