Anisotropic magnetoresistance:A 170-year-old puzzle solved

• 作者: Gerrit E.W.Bauer
• 来源期刊: 中国科学：物理学 力学 天文学（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: New & Views
• 页码范围: 120-121
• 页数: 2页
• 语种: 英文

摘要

Thomson[1],the later Lord Kelvin,reported an increased electric resistance in iron and nickel when the magnetization is parallel rather than normal to the current direction,an effect now called anisotropic magnetoresistance(AMR).The AMR allows sensing magnetic fields by simply measuring the resistance change when the magnetization realigns.While the magnetoresistance of magnetic tunnel junctions is larger,AMR sensors are attractive by their simplicity and robustness.Alloys of the transition metals Fe,Ni,and Co are the materials of choice because they combine a large AMR ratio with other convenient properties[2].In a convergence and culmination of methods and ideas developed in the past decades,a collaboration led by Zhe Yuan from Beijing Normal University(theory)and Yizheng Wu from Fudan University(experiments)recently solved the conundrum of the AMR for the generic alloy CoxFe1-x[3].