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Magnetoresistance dynamics in superparamagnetic Co-Fe-B nanodots
Physical Review Applied ( IF 4.532 ) Pub Date : 
Brad Parks, Ahmed Abdelgawad, Thomas Wong, Richard F. L. Evans, and Sara A. Majetich

Individual disk-shaped CoFeB nanodots were driven into a superparamagnetic state by spin transfer torque, and their time-dependent magnetoresistance fluctuations were measured as a function of current. A thin layer of oxidation at the edges has a dramatic effect on the magnetization dynamics. A combination of experimental results and atomistic spin simulations show that pinning to oxide grains can reduce the likelihood that fluctuations lead to reversal, and can even change the easy axis direction. Exchange bias loop shifts and training effects are observed even at room temperature after brief exposure to small fields. The results have implications for studies of core-shell nanoparticles and small magnetic tunnel junctions and spin torque oscillators.
更新日期:2020-01-13

 

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