Effects of anisotropy and spin-asymmetry of ferromagnetic materials in ferromagnetic/Cr_2O_3/ferromagnetic trilayers

摘要

Strong effects of ferromagnetic (FM) materials on the exchange coupling are observed at different temperatures in FM_1( nm)/Cr_2O_3(6 nm)/FM_2(10 nm) trilayers with FM≡Co, Fe, or Ni_(80)Fe_(20). Changes of the anisotropy of FM and spin-asymmetry of the reflection coefficients for spin-up and spin-down electrons of FM contacted the antiferromagnetic layer influence the strength of interfacial and interlayer coupling of the trilayers. Thus, the reduction of the interfacial coupling and the enhancement of the interlayer coupling with increasing temperature result in quite different magnetic behavior of different trilayers.