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VOLUME 105 | ISSUE 1 | PAGE 32
XMCD study of local magnetic and structural properties of microcrystalline NdFeB-based alloys1)
X-ray Magnetic Circular Dichroism (XMCD) technique was used to investigate local magnetic properties of microcrystalline Nd10.4Zr4.0Fe79.2B6.4 samples, oriented along either easy or hard magnetization direction. The Nd  L2,3  and Fe K edge XMCD spectra were measured at room temperature under a magnetic field of \pm10 T. A very strong dependence of XMCD spectra on the sample orientation has been observed at the  L2,3 -edges of Nd, whereas the Fe K-edge XMCD spectra are found to be practically isotropic. This result indicates that magnetic anisotropy of NdFeB-based alloys originates from the Nd sublattice. In addition element selective magnetization curves have been recorded by measuring the intensity of XMCD signals as a function of an applied magnetic field up to  \pm17 T. To find a correlation between local and macroscopic magnetic properties of studied samples we compared these data with magnetization curves, measured by vibrating sample magnetometer up to  \pm14 T. Results are important for understanding the origin of high-coercivity state in NdFeB-based intermetallic compounds.

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