Magnetic properties of hematite with large coercivity

被引：0

作者：

P. G. Bercoff

H. R. Bertorello

机构：

[1] Universidad Nacional de Córdoba,FaMAF, IFEG, Conicet

来源：

Applied Physics A | 2010年 / 100卷

关键词：

Hematite; High Coercivity; Hard Peak; Weakly Ferromagnetic; Hematite Particle;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The magnetic properties of hematite powders produced by a solid state nucleation-and-growth process are studied as a function of temperature T and applied field H. Independently of the temperature, there exists a soft magnetic contribution that is assigned to the canting of spins at the superficial shell of each particle and is not affected by the Morin transition. At 220<T<TM a magnetic contribution with high coercivity is observed, due to spin–flop in the anti ferromagnetic state and above TM=248 K the weakly ferromagnetic state has a coercivity that ranges from 6 kOe to 4 kOe when raising T up to room temperature. Different sub-grain structures were obtained by means of isochronal and isothermal annealing. Changes in the susceptibility are directly related to the sub-particle size. It is concluded that sub-boundaries are the defects responsible for the high coercivities observed in the weakly ferromagnetic state.

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页码：1019 / 1027

页数：8

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