Effect of field cooling on magnetic properties of ultrafine CoO/Co particles |
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| Authors: | SM Zhou D Imhoff K Yu-Zhang Y Leprince-Wang |
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| Institution: | (1) Surface Physics Laboratory (State Key Laboratory) and Department of Physics, Fudan University, Shanghai, 200433, China;(2) Laboratoire de Physique des Solides, Bat. 510, Université Paris-Sud, 91405 Orsay Cedex, France;(3) Laboratoire d Analyse des Solides Surfaces Interfaces – DTI, Université de Reims, B.P. 1039, 51687 Reims Cedex 02, France;(4) Laboratoire de Physique des Matériaux Divisés et Interfaces, Université de Marne la Vallée, 5, Bd. Descartes, 77454 Marne la Vallée Cedex 2, France |
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| Abstract: | In CoO-Ag granular films with small CoO contents, we have observed ultrafine Co particles inside or on the surface of the CoO particles. After field cooling under the external magnetic field of 50 kOe, a sustained magnetization (or vertical) shift and exchange field shift were observed. The magnetization shift and the exchange field shift increased as the cooling field is increased and temperature decreased, in correlation to each other. PACS 75.30.Et; 75.30.Gw; 75.75.+a |
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