Methods and Systems for Writing to Magnetic Memory Devices Utilizing Alternating Current

A method for selectively writing to STT-MRAM using an AC current is provided. The method is performed in a memory device including two or more multilevel magnetic tunnel junctions (MTJs) arranged in series with respect to a single terminal of a transistor, where the two or more multilevel MTJs inclu...

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Bibliographic Details
Main Authors Bozdag, Kadriye Deniz, Ryan, Eric Michael, Tzoufras, Michail, Gajek, Marcin
Format Patent
LanguageEnglish
Published 04.07.2019
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
INDUCTANCES
INFORMATION STORAGE
MAGNETS
PHYSICS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
SEMICONDUCTOR DEVICES
STATIC STORES
TRANSFORMERS
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Summary:A method for selectively writing to STT-MRAM using an AC current is provided. The method is performed in a memory device including two or more multilevel magnetic tunnel junctions (MTJs) arranged in series with respect to a single terminal of a transistor, where the two or more multilevel MTJs include a first MTJ having a first magnetic characteristic and first electrical characteristic and a second MTJ having a second magnetic characteristic that is distinct from the first magnetic characteristic and a second electrical characteristic. The method includes writing to an MTJ. The writing includes applying a DC current to the two or more MTJs and applying an AC current to the two or more MTJs, where the AC current is adjusted to a frequency that is tuned to a write assist frequency corresponding to the respective MTJ.
Bibliography:Application Number: US201715859256