Control of magnetism across metal to insulator transitions

de la Venta, J.; Wang, Siming; Ramirez, J. G.; Schuller, Ivan K.
March 2013
Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p122404
Academic Journal
Magnetic properties (coercivity and magnetization) of ferromagnetic films are strongly affected by the proximity to materials that undergo a metal to insulator transition. Here, we show that stress associated with structural changes across the metal-insulator phase transition in VO2 and V2O3 produces a magnetoelastic anisotropy in ferromagnetic films (Co and Ni) deposited on top of the oxides. The changes in coercivity are as large as 168% and occur in a very narrow temperature range. This effect can be controlled and inverted by the thickness and the deposition temperature of the ferromagnetic films, which is very flexible for important technological applications.


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