Temperature dependent switching properties of patterned 200 nm Ni[sub 81]Fe[sub 19] elements

Li, Jian; Shi, Jing; Tehrani, Saied
December 2001
Applied Physics Letters;12/3/2001, Vol. 79 Issue 23, p3821
Academic Journal
Quasistatic magnetization switching of patterned 200 nm wide Ni[sub 81]Fe[sub 19] elements has been systematically studied over a wide range of temperatures. In large aspect-ratio elements, the switching field between two bistable magnetization states decreases linearly as the temperature increases, in good agreement with thermally activated nucleation theory. In small aspect-ratio elements, however, switching occurs through a third stable state: the magnetization vortex state. Although the switching mechanism is drastically different in these small aspect-ratio structures, the switching fields also are linearly dependent on temperature. © 2001 American Institute of Physics.


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