Reducing extrinsic hysteresis in first-order La(Fe,Co,Si)13 magnetocaloric systems

被引：89

作者：

Moore, J. D. ^{[1
]}

Morrison, K. ^{[1
]}

Sandeman, K. G. ^{[1
]}

Katter, M. ^{[2
]}

Cohen, L. F. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2AZ, England

[2] Vacuumschmelze GmbH & Co KG, D-63450 Hanau, Germany

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 25期

关键词：

PHASE-TRANSITION; LA(FEXSI1-X)(13); GD5SI2GE2;

D O I：

10.1063/1.3276565

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Simultaneous magnetization and sample temperature measurements were performed as a function of magnetic field and magnetic field sweep-rates to study the influence of these conditions on the hysteresis of the magnetocaloric transition in La (Fe1-x-yCoxSiy)(13) samples. The large magnetocaloric effect in the compounds that show a first-order transition cause a significant departure from isothermal conditions leading to dynamic sweep-rate dependent magnetic hysteresis. Here we show how this deleterious effect can be greatly reduced by changing the sample geometry or by use of materials which show a second-order transition only. The key signatures of nonisothermal conditions in the magnetization data are highlighted. (C) 2009 American Institute of Physics. [doi:10.1063/1.3276565]

引用

页数：3