Magnetic Field Dependence of Au Spin Polarization Induced in the Epitaxial Fe/Au(001) Multilayer with Antiferromagnetic Interlayer Coupling by Resonant X-ray Magnetic Scattering

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The applied field dependence of the depth distribution of Au spin polarization is investigated for an epitaxial Fe/Au(001) multilayer with antiferromagnetic interlayer coupling by resonant X-ray magnetic diffraction using circularly polarized synchrotron X-rays near the Au L3 absorption edge. The magnetic Bragg intensities of the multilayer are measured up to the fifth order with varying the applied field between $\pm 500$ Oe. All magnetic diffraction intensities are found to be proportional to the Fe layer magnetization at the same applied field. This result indicates that the size of the induced Au spin polarization parallel to the applied field direction is proportional to the Fe layer magnetization and that the depth distribution of the induced Au spin polarization scaled to the Fe layer magnetization is unchanged during the magnetization process of the antiferromagnetically coupled Fe layers.
2009-09-15