Spin Parity Effect on Magnetic Relaxation by Quantum Tunneling in Nanomagnets  

作　　者：ZHANG Shu-Qun CHEN Zhi-De 

机构地区：[1]Department of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China [2]Department of Physics, Jinan University, Guangzhou 510632, China

出　　处：《Communications in Theoretical Physics》2008年第7期248-252,共5页理论物理通讯（英文版）

基　　金：National Natural Science Foundation of China under Grant No.10575045

摘　　要：Spin parity effect on magnetic relaxation by quantum tunneling in the biaxial spin model is studied by taking into account the transverse local stray field. It is shown that the square root time dependence in the even resonance occurs in the presence of a distribution of transverse anisotropic parameters, while the odd resonance always shows exponential relaxation. Magnetic relaxation under a sweeping field is also studied. The variation of the relaxation curve with the increasing distribution width of the local stray field for even resonance is qualitatively different from that of the odd resonance. The theoretical result on even resonance is in agreement with experimental results on Fe8 system, while the prediction for odd resonance awaits the experimental verification.

关 键 词：single molecule magnet spin parity effect quantum tunneling 

分 类 号：O413[理学—理论物理]