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Deterministic multi-level spin orbit torque switching using He+ microscopy patterning

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arxiv 2301.02188 v1 pith:LOOMZZX3 submitted 2023-01-04 cond-mat.mes-hall cond-mat.mtrl-sciphysics.app-ph

Jinu Kurian (1) , Aleena Joseph (1) , Salia Cherifi-Hertel (1) , Ciaran Fowley (2) , Gregor Hlawacek (2) , Peter Dunne (2) , Michelangelo Romeo (1) , Gwenaël Atcheson (3)
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J. M. D. Coey (3) Bernard Doudin (1) ((1) Université de Strasbourg CNRS Strasbourg France (2) Institute of Ion Beam Physics Materials Research Helmholtz-Zentrum Dresden Rossendorf Dresden Germany (3) AMBER School of Physics Trinity College Dublin Ireland)
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classification cond-mat.mes-hallcond-mat.mtrl-sciphysics.app-ph
keywords switchingdeterministicirradiationmultilevelpatternanisotropyareasbars
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abstract

He$^+$ ion irradiation is used to pattern multiple areas of Pt/Co/W films with different irradiation doses in Hall bars. The resulting perpendicular magnetic anisotropy landscape enables selective multilevel current-induced switching, with full deterministic control of the position and order of the individual switching elements. Key pattern design parameters are specified, opening a way to scalable multilevel switching devices.

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