Magnetooptical studies on spin-reorientation in rare earth orthoferrites. [(ErSm)FeO/sub 3/, DyFeO/sub 3/, YFeO/sub 3/]

Conference · Thu Jan 01 00:00:00 EST 1976 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:7269294

Koshizuka, N; Hayashi, K; Suzuki, M; Tsushima, T

Several types of spin-reorientation (SR) in some of the RFeO/sub 3/ are studied by Faraday rotation measurements; rotational SR of GAMMA/sub 4/ ..-->.. GAMMA/sub 2/ type in (ErSm)FeO/sub 3/, (Co/sup 2 +/, Ti/sup 4 +/) doped YFeO/sub 3/, and abrupt SR of GAMMA/sub 4/ ..-->.. GAMMA/sub 1/ type in DyFeO/sub 3/. Observations of SR by Faraday rotation were made in these crystals with incident light parallel to the optical axis. In relation with the decrease of Fe/sup 3 +/ ion's anisotropy at T/sub SR/, an abrupt decrease of the coercive force are found in these systems. In general, Faraday rotation in RFeO/sub 3/ originates from Fe/sup 3 +/ ions in the visible and near IR regions, while R/sup 3 +/ ion's contribution to the Faraday rotation was observed for the wavelengths corresponding to the electronic transitions of R/sup 3 +/ ions in ErFeO/sub 3/ and DyFeO/sub 3/ at low temperatures. In DyFeO/sub 3/, a large contribution of Dy/sup 3 +/ ions was observed at approximately 1.2 ..mu..m in the Faraday spectrum, and it is confirmed that the Dy/sup 3 +/ moments are polarized along the c-axis in zero applied field above T/sub SR/. Magnetic field induced SR was also observed in DyFeO/sub 3/, and the temperature dependence of the critical field was obtained as H/sub SR/ varies as absolute value T - T/sub SR/3/4.

• Research Organization: Electrotechnical Lab., Tokyo
• OSTI ID: 7269294
• Journal Information: AIP (Am. Inst. Phys.) Conf. Proc.; (United States), Vol. 29; Conference: 21. annual conference on magnetism and magnetic materials, Philadelphia, PA, USA, 9 Dec 1975; Other Information: See CONF-751209--
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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