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Discovery of a High Spin Freezing Temperature and Control of a Spin-Glass State in Mg1.5FeTi0.5O4 Spinel Films

Published online by Cambridge University Press:  10 February 2011

Y. Muraoka ,
H. Tabata  and
T. Kawai
Y. Muraoka
Affiliation:
ISIR-Sanken, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
H. Tabata
Affiliation:
ISIR-Sanken, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
T. Kawai
Affiliation:
ISIR-Sanken, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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Abstract

A spin-glass state up to 210 K has been found in (Mg,Fe){Mg,Fe,Ti)2O4 spinel ferrite thin films formed on α-Al2O3(0001) substrates. The long-time relaxation of the magnetization in zero-field-cooled operation, which is characteristic feature of the spin-glass state, has been observed below 210 K. We have also achieved the change of magnetic state in the film from spin-glass to ferrimagnet over a wide temperature range below 160 K by means of light-irradiation. The amount of spin-melt on light-irradiation is calculated to be 41 % at 10 K and 26 % at 100 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 307
Copyright
Copyright © Materials Research Society 2000

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