Anisotropic magnetization reversal in 30 nm triangular FeNi dots

Niu, D. X.; Zou, X.; Wu, J.; Xu, Y. B.
February 2009
Applied Physics Letters;2/16/2009, Vol. 94 Issue 7, pN.PAG
Academic Journal
We present the room temperature magnetization hysteresis loop measurements of a triangularly shaped Fe64Ni36 dot array with the feature size down to 30 nm using magneto-optical Kerr effect. An in-plane anisotropic magnetization reversal and an enhanced coercivity have been observed in these magnetic dots. In combining with micromagnetic calculations, we found that the magnetization process follows two steps, the rotation of the top corner and the switching of the bottom base, respectively, controlled by the nanometer scale local magnetic shape anisotropy, and the thermal activation is negligible even in this length scale.


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