Exchange bias through a Cu interlayer in an IrMn/Co system
Exchange bias through a Cu interlayer in an IrMn/Co system
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DOI：
10.1103/physrevb.75.214402
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发表时间：
2007-06
影响因子：
3.7
通讯作者：
J. Geshev;S. Nicolodi;L. G. Pereira;L. Nagamine;J. E. Schmidt;C. Deranlot;F. Petroff;R. L. Rodríguez-Suárez;A. Azevedo
中科院分区：
文献类型：
--
作者：
J. Geshev;S. Nicolodi;L. G. Pereira;L. Nagamine;J. E. Schmidt;C. Deranlot;F. Petroff;R. L. Rodríguez-Suárez;A. Azevedo
Ferromagnetic resonance (FMR) and magnetization (MAG) measurements were used to study the exchange interaction between the antiferromagnetic and ferromagnetic layers in an $\mathrm{Ir}\mathrm{Mn}∕\mathrm{Cu}∕\mathrm{Co}$ system as a function of the Cu spacer thickness. Although the experimental angular variations of the exchange-bias fields ${H}_{\mathit{eb}}^{\mathrm{FMR}}$ and ${H}_{\mathit{eb}}^{\mathrm{MAG}}$ coincide, the coupling strengths $J$ and the Co layers' anisotropy fields ${H}_{U}$, obtained via numerical simulations, are different. For all Cu thicknesses ${J}^{\mathrm{FMR}}g{J}^{\mathrm{MAG}}$ and ${H}_{U}^{\mathrm{FMR}}l{H}_{U}^{\mathrm{MAG}}$. The exchange coupling decreases exponentially with the spacer thickness and is a short-range interaction. These characteristics were explained in the framework of a model considering polycrystalline magnetic layers with independent easy axis distributions, taking into account the rotatable anisotropy. The role of antiferromagnetic grains at the interface with different sizes and different magnetic stabilities is essential for understanding the behavior of this exchange-biased system.
Ferromagnetic resonance (FMR) and magnetization (MAG) measurements were used to study the exchange interaction between the antiferromagnetic and ferromagnetic layers in an $\mathrm{Ir}\mathrm{Mn}∕\mathrm{Cu}∕\mathrm{Co}$ system as a function of the Cu spacer thickness. Although the experimental angular variations of the exchange-bias fields ${H}_{\mathit{eb}}^{\mathrm{FMR}}$ and ${H}_{\mathit{eb}}^{\mathrm{MAG}}$ coincide, the coupling strengths $J$ and the Co layers' anisotropy fields ${H}_{U}$, obtained via numerical simulations, are different. For all Cu thicknesses ${J}^{\mathrm{FMR}}g{J}^{\mathrm{MAG}}$ and ${H}_{U}^{\mathrm{FMR}}l{H}_{U}^{\mathrm{MAG}}$. The exchange coupling decreases exponentially with the spacer thickness and is a short-range interaction. These characteristics were explained in the framework of a model considering polycrystalline magnetic layers with independent easy axis distributions, taking into account the rotatable anisotropy. The role of antiferromagnetic grains at the interface with different sizes and different magnetic stabilities is essential for understanding the behavior of this exchange-biased system.