Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10653212 | Solid State Communications | 2005 | 6 Pages |
Abstract
Thin films of (111)-oriented spinel ferrite Al0.5Fe2.5O4 have been prepared by a pulsed-laser deposition (PLD) technique on α-Al2O3 (0001) substrates. The films exhibit cluster-glass behaviors with a spin-freezing temperature, Tg, near or above room temperature. The magnetization was found to increase following light irradiation below Tg, which indicates the photoinduced melting of cluster-glass states. An analysis comparing the dynamic behavior of magnetic response to light irradiation between zero-field-cooled (ZFC) states and field-cooled (FC) states at 10 K under various light intensities, I, revealed that the direct photoexcitation of spins occurs when Iâ¤0.78 mW/mm2, while the thermal heating effect following the light absorption of the samples also contributes to the enhancement of magnetization when Iâ¥1.22 mW/mm2. The magnetization of the films could be controlled by light irradiation even at room temperature. This suggests the possibility of utilizing these films in the development of novel magneto-optical memory devices.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Munetoshi Seki, A.K.M. Akther Hossain, Hitoshi Tabata, Tomoji Kawai,