Criteria for saturated magnetization loop

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:402

Article

Harres, A.¹  Mikhov, M.²  Skumryev, V.^3,4  de Andrade, A. M. H.⁵  Schmidt, J. E.⁵  Geshev, J.^4,5 

[1] Univ Fed Santa Maria, Dept Fis, BR-97105900 Santa Maria, RS, Brazil

[2] Univ Sofia, Fac Phys, Sofia 1164, Bulgaria

[3] Inst Catalana Recerca & Estudis Avancats, Barcelona 08010, Spain

[4] Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, Spain

[5] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil

关键词: Major hysteresis loop;    Minor hysteresis loop;    Remanent magnetization curves;    Magnetic anisotropy;    Exchange bias;   

DOI  :  10.1016/j.jmmm.2015.11.046

来源: Elsevier

【 摘 要 】

Proper estimation of magnetization curve parameters is vital in studying magnetic systems. In the present article, criteria for discrimination non-saturated (minor) from saturated (major) hysteresis loops are proposed. These employ the analysis of (i) derivatives of both ascending and descending branches of the loop, (ii) remanent magnetization curves, and (iii) thermomagnetic curves. Computational simulations are used in order to demonstrate their validity. Examples illustrating the applicability of these criteria to well-known real systems, namely Fe3O4 and Ni fine particles, are provided. We demonstrate that the anisotropy-field value estimated from a visual examination of an only apparently major hysteresis loop could be more than two times lower than the real one. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free