Compositional dependence of magnetic anisotropy in chemically synthesized Co3−xFexO4 (0 ≤ x ≤ 2). (10th November 2017)

• Record Type: Journal Article
• Authors: Hayashi, Kensuke; Yamada, Keisuke; Shima, Mutsuhiro
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 1(2018)Supplement 1
• Publication Date: 2017-11-10
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.01AF02
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Magnetic anisotropy of Co3− x Fe x O4 (CFO, 0 ≤ x ≤ 2) thin-film and powder samples prepared by a sol–gel method has been investigated as a function of Fe composition x . Structural analyses by X-ray diffraction show that CFO powder samples exhibit diffraction peaks associated with the spinel structure when x < 2, while CFO thin-film samples with thickness of 130–510 nm yield the peaks when 0 ≤ x ≤ 2. CFO thin-film samples are highly (111)-oriented with the Lotgering factor greater than 0.9 when 0.6 ≤ x ≤ 1.3. The magnetic anisotropy constant K 1 of CFO powder samples estimated from their room-temperature hysteresis loops yields a minimum when x = 0.9. Relatively large in-plane magnetic anisotropy ( K eff = 5.7 × 10 5 erg/cm 3 ) is observed for the CFO thin-film sample when x = 1.3. With increasing x, the magnetic easy axis of the spinel CFO changes from ⟨111⟩ to ⟨100⟩ when x = 0.9.