中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5496-5500.doi: 10.1088/1674-1056/18/12/061

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The phenomenon of even bulk modes variance in a ferromagnetic A--A bilayer system

周文平1, 梁希侠1, 云国宏2   

  1. (1)Laboratory of Solid State Physics, Department of Physics, Inner Mongolia University, Hohhot 010021, China; (2)Laboratory of Solid State Physics, Department of Physics, Inner Mongolia University, Hohhot 010021, China;Department of Physics, Inner Mongolia Normal University, Hohhot 010021, China
  • 收稿日期:2009-04-17 修回日期:2009-09-11 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the Foundation for Key Program of Ministry of Education, China (Grant No 206024), National Natural Science Foundation of China (Grant No 10762001), Program for New Century Excellent Talents in University of China (Grant No NCET-05-027

The phenomenon of even bulk modes variance in a ferromagnetic A--A bilayer system

Zhou Wen-Ping(周文平)a) † ,Yun Guo-Hong(云国宏)a)b), and Liang Xi-Xia(梁希侠) a)   

  1. a Laboratory of Solid State Physics, Department of Physics, Inner Mongolia University, Hohhot 010021, China; b Department of Physics, Inner Mongolia Normal University, Hohhot 010021, China
  • Received:2009-04-17 Revised:2009-09-11 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the Foundation for Key Program of Ministry of Education, China (Grant No 206024), National Natural Science Foundation of China (Grant No 10762001), Program for New Century Excellent Talents in University of China (Grant No NCET-05-027

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摘要： The eigenproblems of spin waves in a symmetrical ferromagnetic bilayered system with periodic boundary conditions are solved using the interface-rescaling approach (IRA). The results show that interface coupling between two sublayers would not change the excitation energy of odd bulk modes, but change excitation energy of even bulk modes. We call this peculiar phenomenon the phenomenon of even bulk mode variance (PEBMV). There are two kinds of mechanisms which cause PEBMV: phase reversal and phase translation of the magnon at the interface, corresponding, respectively, to the antiferromagnetic and ferromagnetic interface coupling cases. PEBMV embodies the selective effect of the interface on different bulk magnons.

Abstract: The eigenproblems of spin waves in a symmetrical ferromagnetic bilayered system with periodic boundary conditions are solved using the interface-rescaling approach (IRA). The results show that interface coupling between two sublayers would not change the excitation energy of odd bulk modes, but change excitation energy of even bulk modes. We call this peculiar phenomenon the phenomenon of even bulk mode variance (PEBMV). There are two kinds of mechanisms which cause PEBMV: phase reversal and phase translation of the magnon at the interface, corresponding, respectively, to the antiferromagnetic and ferromagnetic interface coupling cases. PEBMV embodies the selective effect of the interface on different bulk magnons.

Key words: spin waves, magnetic multilayer, magnon

中图分类号:  (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))

  • 75.70.Cn
75.30.Ds (Spin waves) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))