Large magnetic entropy change and magnetic properties in La (Fe1-xMnx)11.7 Si1.3Hy compounds

• 来源期刊: 中国物理（英文版）
• 关键词: magnetic entropy change itinerant-electron metamagnetic transition
• 年，卷（期）: 2003,（8）
• 页码范围: 911-914
• 页数: 4页
• 语种: 英文

摘要

Magnetic properties and magnetic entropy change in La(Fe1-xMnx)l1.7Si1.3Hy compounds have been investigated. A significant increase of the Curie temperature Tc and a small increase of the saturation magnetizationsμs have been observed after the introduction of interstitial H, which caused a slight volume expansion. The first-order field-induced itinerant-electron metarnagnetic (IEM) transition remains and brings about a large magnetic entropy change around room temperatures for the compounds. The maximal magnetic entropy change is about 23.4, 17.7and 15.9J/kg.K under a magnetic field change from 0 to 5T for x=0.01, 0.02 and 0.03, respectively. Therefore, the compounds appear to be potential candidates for magnetic refrigerants around room temperatures.