A variable pole magnet. (25th January 2018)

• Record Type: Journal Article
• Authors: Çakır, Aslı; Krenke, Thorsten; Farle, Michael; Acet, Mehmet
• Is Part Of: Journal of physics. Volume 30:Number 7(2018)
• Publication Date: 2018-01-25
• Subjects: Heusler precipitates -- soft-ferromagnet -- shell-ferromagnet -- phase separation; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aaa5f5
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The off-stoichiometric antiferromagnetic Heusler alloy Fe50 Mn45 Ga5 decomposes and forms ferromagnetic Fe50 Mn25 Ga25 precipitates embedded in an antiferromagnetic Fe50 Mn50 matrix when temper-annealed at temperatures T > 550 K. The ferromagnetism of the precipitates is soft so that the magnetization direction of the non-interacting precipitates in a macroscopic material can be manipulated by locally applied fields so that even two similar poles can form at the ends of a centimeter-long bar. The cause for the soft magnetic behavior is due to the weak AF exchange anisotropy of the cubic Fe50 Mn50 matrix and the precipitate.