Magnetization, magnetocrystalline anisotropy and magnetostriction of Tb2Co17, Ho2Co17and Er2Co17single crystals

Author

Miller, A.E. ; D´Silva, T. ; Rodrigues, H.

Author_Institution

University of Notre Dame, Notre Dame, Indiana

Volume

12

Issue

6

fYear

1976

fDate

11/1/1976 12:00:00 AM

Firstpage

1006

Lastpage

1008

Abstract

This paper describes the temperature dependence of magnetization, the anisotropy constant K1and the magnetostriction constant λ^gammaof single crystals of Tb2Co17, Ho2Co17and Er2Co17over the temperature range 77.4°K to 400°K. Tb2Co17and Ho2Co17have a uniformly easy magnetization in the basal plane while Er2Co17maintains an easy C axis over the entire temperature range. The anisotropy constant K1was determined by a least square fit of the theoretical equation of magnetization to the measured magnetization curve along the hard axis. The anisotropy constant K1at 297°K for Tb2Co17, Ho2Co17and Er2Co17is, $-3.2\\times10^{7}$ , $-0.9\\times10^{7}$ and $0.41\\times10^{7}$ ergs/cm³, respectively. The magnetostriction coefficient λ^γwas determined by the strain gage technique. The contribution of the Tb ion to the magnetostriction constant λ^γof the R2Co17compound is positive whereas the contribution of the Ho ion is negative. The magnetostrictive behavior of the Tb ion is single ion in nature.

Keywords

Magnetic anisotropy; Magnetic thermal factors; Magnetostriction; Permanent magnet materials; Anisotropic magnetoresistance; Crystals; Erbium; Least squares methods; Magnetic anisotropy; Magnetization; Magnetostriction; Perpendicular magnetic anisotropy; Temperature dependence; Temperature distribution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1976.1059170

Filename

1059170