Physics – Condensed Matter – Materials Science
Scientific paper
2008-12-29
Appl. Phys. Lett. 93 (2008) 172510
Physics
Condensed Matter
Materials Science
Scientific paper
10.1063/1.3005644
Ferromagnetic resonance and static magnetic properties of CoFe/Al2O3/CoFe/Py and CoFe/Al2O3/CoFeB/Py magnetic tunnel junctions and of 25nm thick single-layer Permalloy(Py) films have been studied as a function of temperature down to 2K. The temperature dependence of the ferromagnetic resonance excited in the Py layers in magnetic tunnel junctions shows knee-like enhancement of the resonance frequency accompanied by an anomaly in the magnetization near 60K. We attribute the anomalous static and dynamic magnetic response at low temperatures to interface stress induced magnetic reorientation transition at the Py interface which could be influenced by dipolar soft-hard layer coupling through the Al2O3 barrier.
Aliev Farkhad G.
Garcia-Hernandez M. M.
Metlushko Vitali
Pryadun V. V.
Russek Stephen E.
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