Broadband ferromagnetic resonance characterization of anisotropies and relaxation in exchange-biased IrMn/CoFe bilayers

Article

关键词: EXTRINSIC CONTRIBUTIONS;    MAGNETIZATION REVERSAL;    ULTRATHIN FILMS;    LINEWIDTH;    FIELD;    INPLANE;   

DOI  :  10.1103/PhysRevB.95.064414

来源: SCIE

【 摘 要 】

The magnetization dynamics of exchange-biased IrMn/CoFe bilayers have been investigated using broadband and in-plane angle-dependent ferromagnetic resonance spectroscopy. The interface energy of the exchange bias effect in these bilayers exceeds values previously reported for metallic antiferromagnets. A strong perpendicular magnetic anisotropy and a small in-plane uniaxial anisotropy are also observed in these films. The magnetization relaxation of the bilayers has a strong unidirectional contribution, which is in part caused by two-magnon scattering. However, a detailed analysis of in-plane angle-and thickness-dependent linewidth data strongly suggests the presence of a previously undescribed unidirectional relaxation mechanism.

【 授权许可】

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