Shape-induced ferromagnetic ordering in a triangular array of magnetized disks

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Shape-induced ferromagnetic ordering in a triangular array of magnetized disks

Authors
Publisher
American Institute of Physics
Keywords
  • Ferromagnetism
  • Magnetization
  • Hysteresis
  • Computer Simulation
  • Phase Transitions
  • Aspect Ratio

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. © 2005 American Institute of Physics.

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