A FREEZING FERROMAGNETIC MOMENT MODEL FOR EXCHANGE BIAS IN α-Fe2O3 NANOLEAVES

作者：Xu, Ying-Ying; Dong, Zhao; Zhang, Xiong-Jian; Jin, Wen-Tao; Kashkarov, Pavel; Zhang, Han^*

来源：International Journal of Modern Physics C, 2009, 20(5): 761-768.

DOI：10.1142/S0129183109013984

• Freezing moment
• model
• exchange bias
• alpha-Fe2O3 nanoleaf

We propose a freezing ferromagnetic moment model to explain the exchange bias discovered in alpha-Fe2O3 antiferromagnetic nanoleaves most recently. The model assumes that in the antiferromagnetic nanosystem, the disorder surface spins are frozen at low temperature along magnetic filed direction, forming a ferromagnetic layer. Then this results in an exchange bias. After some proper simplification, we get the magnetization at different applied field by the minimal energy calculation using MATLAB. Our model computerizing indicates the exchange bias shift of the magnetization curve is -48.2 Oe for n = 100 antiferromagentic layers, which matches the observed value very well.

• 出版日期2009-5
• 单位北京大学