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Enhanced orbital magnetic moment in FeCo nanogranules observed by Barnett effect

Ogata, Yudai; Chudo, Hiroyuki ; Gu, B.; Kobayashi, Nobukiyo*; Ono, Masao  ; Harii, Kazuya; Matsuo, Mamoru; Saito, Eiji; Maekawa, Sadamichi

The gyroscopic g factor, $$g'$$, of FeCo nanogranules embedded in a matrix of MgF$$_2$$ (FeCo-MgF$$_2$$) was determined by measuring the magnetic-field generation from a rotating sample due to the Barnett effect. The $$g'$$ value of the FeCo-MgF$$_2$$ is estimated to be 1.76 $$pm$$ 0.11. The orbital contribution to the magnetic moment in the FeCo nanogranules was found to be quite large compared with that in bulk FeCo, being consistent with a density-functional-theory calculation that shows that the orbital magnetic moment may increase at the FeCo/MgF$$_2$$ interfaces. The result suggests that the orbital magnetic moment is enhanced by symmetry breaking at the surface of the FeCo nanogranules.



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Category:Materials Science, Multidisciplinary



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