A magnetic transition induced by shape anisotropy, geometry, and dipolar interactions has been found in a system of three single domain thin disks. The phase transition occurs only when the disks are in close proximity, and for a narrow range of aspect ratios. Near the transition, the system has an abrupt change from a closure-domain state with zero net magnetization to a magnetized state. The transition can be detected by changes in the hysteresis loops. Micromagnetic simulations with realistic parameters confirm the establishment of ferromagnetic ordering. (C) 2005 American Institute of Physics.
Shape-induced ferromagnetic ordering in a triangular array of magnetized disks / Beleggia, M; Zhu, Y; Tandon, S; De Graef, M. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 87:20(2005). [10.1063/1.2131181]
Shape-induced ferromagnetic ordering in a triangular array of magnetized disks
Beleggia M;
2005
Abstract
A magnetic transition induced by shape anisotropy, geometry, and dipolar interactions has been found in a system of three single domain thin disks. The phase transition occurs only when the disks are in close proximity, and for a narrow range of aspect ratios. Near the transition, the system has an abrupt change from a closure-domain state with zero net magnetization to a magnetized state. The transition can be detected by changes in the hysteresis loops. Micromagnetic simulations with realistic parameters confirm the establishment of ferromagnetic ordering. (C) 2005 American Institute of Physics.
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