Magnetic Properties of Oxygen Deficient Y_{0.33}Sr_{0.67}CoO_{3-δ}

• Authors: Y. Zhang , S. Sasaki , O. Yanagisawa , M. Izumi
• Languages of publication: EN

Abstracts

EN

We studied magnetic properties of perovskite-type Y_{0.33}Sr_{0.67} CoO_{2.614} and Y_{0.33}Sr_{0.67}CoO_{2.707} prepared under different sintered temperatures at 1250ºC and 1100ºC, respectively. A dc magnetization jump associated with a large thermal hysteresis around 180 K was found in Y_{0.33}Sr_{0.67}CoO_{2.614}, which indicates a kind of magnetic memory effect. On the other hand, Y_{0.33}Sr_{0.67}CoO_{2.707} shows a larger magnetization with a small magnetization jump around 200 K and lower Curie temperature than those of Y_{0.33}Sr_{0.67}CoO_{2.614}. Rich Co^{3+} ions in the low temperature sintered Y_{0.33}Sr_{0.67}CoO_{2.707} possibly introduce large magnetization and high magnetization jump temperature. This may be coming from a surface/volume effect of Co^{3+} ions appearing in the polycrystalline sample prepared at low temperature. The ferromagnetism resulted from the different surface/volume ratio contributes to a part of magnetization and may result in the change of the Curie temperature.

Keywords

EN

72.80.Ga; 75.60.-d; 75.70.Rf; 81.40.Rs

Discipline

• 75.60.-d: Domain effects, magnetization curves, and hysteresis(for dynamics of domain structures, see 75.78.Fg)
• 81.40.Rs: Electrical and magnetic properties related to treatment conditions
• 75.70.Rf: Surface magnetism
• 72.80.Ga: Transition-metal compounds

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 111
• Issue: 1
• Pages: 79-86

Dates

published

2007-01

received

2006-09-04

Contributors

author

Y. Zhang

• Laboratory of Applied Physics, Tokyo University of Marine Science and Technology, 2-1-6, Etchu-jima, Koto-ku, Tokyo 135-8533, Japan

author

S. Sasaki

• Laboratory of Applied Physics, Tokyo University of Marine Science and Technology, 2-1-6, Etchu-jima, Koto-ku, Tokyo 135-8533, Japan

author

O. Yanagisawa

• Yuge National College of Maritime Technology, Ehime 794-2593, Japan

author

M. Izumi

• Laboratory of Applied Physics, Tokyo University of Marine Science and Technology, 2-1-6, Etchu-jima, Koto-ku, Tokyo 135-8533, Japan

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Identifiers

DOI

10.12693/APhysPolA.111.79