X-ray magnetic circular dichroism at IrL2,3 edges in Fe100−x
Ir
x
and Co100−x
Ir
x
alloys: Magnetism of 5d electronic states |
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Authors: | V V Krishnamurthy M Suzuki N Kawamura T Ishikawa |
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Institution: | (1) RIKEN Harima Institute, SPring8, 1-1-1 Kouto, Mikazuki, Sayo, 679-5148 Hyogo, Japan;(2) Japan Synchrotron Radiation Institute, SPring8, 1-1-1 Kouto, Mikazuki, 679-5198 Hyogo, Japan |
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Abstract: | The formation of induced 5d magnetic moment on Ir in Fe100?x Ir x (x=3, 10 and 17) and Co100?x Ir x (x=5, 17, 25 and 32) alloys has been investigated by X-ray magnetic circular dichroism (XMCD) at Ir L2,3 absorption edges. Sum rule analysis of the XMCD data show that the orbital moment of Ir is in the range of ?0.071(2)µB to ?0.030(1)µB in Fe-Ir alloys and ?0.067(2)µB to 0.024(1)µB in Co-Ir alloys. We find that the total moment of Ir in Fe-Ir alloys is approximately 1/5 of the total 3d moment on Fe at all the three compositions. In contrast, the total moment on Ir in Co-Ir alloys varies between 1/6 to 1/16 of the 3d moment on cobalt. The observed trends of Ir moments and the role of interatomic exchange interactions in 5d moment formation are discussed. |
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Keywords: | Magnetic dichroism d electrons magnetic moments |
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