Magnetocrystalline anisotropy of tetragonal phase CuFe2O4

Author

Nagata, Hideo ; Miyadai, Tomonao ; Iyahara, Syohemi

Author_Institution

Hokkaido University, Sapporo, Japan

Volume

8

Issue

3

fYear

1972

fDate

9/1/1972 12:00:00 AM

Firstpage

451

Lastpage

453

Abstract

A small twinned crystal of tetragonal phase CuFe24was obtained, in which tetragonal c axes are almost equally distributed along only two perpendicular directions (taken as Y and Z axes of the crystal). Magnetic torque measurements were made on a small spherical sample (0.63 mm in diameter) at room temperature, 77 K and 4.2 K, and in magnetic fields up to 21 kG. Expressing the uniaxial anisotropy energy (Eu) as $E_{u} = K_{1} \\cos^{2} \\theta + K_{2} \\cos^{4} \\theta + K_{3}\\sin^{4} \\theta \\cos^{2} \\phi \\sin^{2} \\phi, K_{1}, K_{2}$ , and K3were found to equal -8.9 × 10⁵, 11.4 × 10⁵and -8.5 × 10⁵ergs/cc, respectively, at 4.2 K. Their absolute values decrease linearly with temperature. The direction of easy magnetization is not parallel to the c axis but is inclined at about 60°. This inclination is almost independent of temperature.

Keywords

Copper ferrites; Magnetic anisotropy; Anisotropic magnetoresistance; Crystalline materials; Magnetic anisotropy; Magnetic field measurement; Magnetic flux; Magnetic materials; Magnetic separation; Perpendicular magnetic anisotropy; Temperature; Torque measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1972.1067323

Filename

1067323