1. The effect of substrates on magnetic properties and structure of MnZn ferrite films by alternate deposition
- Author
-
Zhang Hong, Wei Fu-Lin, Liu Xiaoxi, Liu Xi, Wang Lan-Xi, and Cao Jiang-Wei
- Subjects
Magnetization ,Materials science ,Nuclear magnetic resonance ,Annealing (metallurgy) ,Analytical chemistry ,General Physics and Astronomy ,Ferrite (magnet) ,Crystallite ,Coercivity ,Anisotropy ,Grain size ,Amorphous solid - Abstract
Mn(1-x)Zn(x)Fe(2)O(4) films were prepared by alternative rf-sputtering from targets of MnFe(2)O(4) and ZnFe(2)O(4). The films were deposited on substrates such as single-crystal Si(100), oxidized single-crystal Si(100), single-crystal Si(100) with ZnFe(2)O(4) underlayer and single-crystal MgO(100). The deposited films are amorphous. After annealing in vacuum furnace at 550 degrees C, the polycrystalline Mn-Zn ferrite crystallizes. The film with composition of Mn(0.5)Zn(0.5)FeO(4) shows better magnetic properties: high magnetization M(s) and lower coercivity H(c). The coercivity of the film deposited on MgO(100) substrate is the lowest. In this paper, the influences of substrate on film structure and the magnetic properties are investigated. It is believed that the magneto-elastic anisotropy resulting from stress in films dominates the coercivity of Mn-Zn ferrite films. The grain size may be refined to nanometer scale instrumentally by using suitable substrate; the stronger exchange coupling between grains would lead to a lower magneto-elastic anisotropy by averaging to the grains. Therefore, the soft magnetic properties of Mn-Zn ferrite films are improved.
- Published
- 2009