Research Papers in Physics and Astronomy


Date of this Version

January 1999


Published by American Physical Society. Phys. Rev. B 59, 457-462 (1999). Copyright © 1999 American Physical Society. Permission to use.


Mechanical milling of initially ordered ferromagnetic SmCo5 produces dramatic increases in coercivity after short (15 min to 1 h) milling times, accompanied by remanence ratios on the order of 0.7 and shifted hysteresis loops. X-ray diffraction shows that milling induces both chemical and structural disorder. The hysteresis-loop shift is continuous and nonlinear with temperature over the range 5–300 K. The high coercivities are attributed to the formation of a nanostructure consisting of crystalline SmCo5 regions separated by a disordered interphase.

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