Atomic Physics Seminars
Monday, April 4, 2016
Physics Building, Room 204
Note special time.
"Exchange Bias and Bi-stable Magneto-Resistance States in Single-Layer Amorphous TbFeCo and TbSmFeCo Thin Films"
Chung Ting (Marco) Ma , UVA- Department of Physics
Amorphous ferrimagnetic TbFeCo and TbSmFeCo thin films are found to exhibit exchange bias and bi-stable magneto-resistance states near compensation temperature. Atom probe tomography, scanning transmission electron microscopy, and energy dispersive spectroscopy mapping reveal two nanoscale amorphous phases with different Tb concentrations distributed within the amorphous films. The observed exchange anisotropy originates from the exchange interaction between the two nanoscale amorphous phases. The micromagnetic model is adopted to study this heterogeneous magnetic material with two interpenetrating nanoscale phases. This study can serve as a platform for developing exchange bias materials with ferrimagnet.
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