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The change in magnetic anisotropy in R2Fe17-xAlx compounds (R=Sm or Tb)

Zhao-hua Cheng, Bao-gen Shen, Bing Liang, Jin-xian Zhang, Fang-wei Wang, Shao-ying Zhang and Hua-yang Gong

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The structure and magnetic properties of R2Fe17-xAlx compounds with R=Sm and with R=Tb were studied. The compounds have a rhombohedral ThsZn17-type structure. The Curie temperature TC is found first to increase and then to decrease with increasing x. The substitution of Al has a significant effect on the magnetic anisotropy of R2Fe17-xAlx compounds. A small amount of Al substitution in Sm2Fe17 induces uniaxial anisotropy and a further substitution results in a change in the easy-magnetization direction from c axis to basal plane, whereas an opposite change in the magnetocrystalline anisotropy has been observed in the alloys of Tb2Fe17-xAlx. The samples of Tb2Fe17-xAlx with x>or=6 exhibit an easy c axis anisotropy.


PACS

75.30.Gw Magnetic anisotropy

75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

61.66.Dk Alloys

75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)

75.50.Bb Fe and its alloys

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 24 (12 June 1995)



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