Thermal stability of nanostructured synthetic ferrimagnets under applied magnetic fields in the 45° direction

C. W. Han, J. K. Han, Sang Ho Lim

Research output: Contribution to journalArticle

Abstract

An accurate analytical equation for the total energy in the framework of the single domain model is used to study the thermal stability of nanostructured synthetic ferrimagnets. Elliptical cells are considered that have lateral dimensions of 160 nm (long axis)×80 nm (short axis) and varying values of thickness asymmetry for the two magnetic layers. The direction of the applied magnetic field, which points to the 45° direction, is in the opposite direction to the thicker layer magnetization. A significant difference is observed in the applied magnetic field dependencies of the equilibrium magnetic configuration and the magnetic energy barrier when using the simplifying assumption that the self-demagnetizing field is identical in magnitude to the dipole field. At a small thickness asymmetry of 0.2 nm, for example, the magnetic energy barrier is reduced from 68 kT (T=300 K) to 6 kT at the remanent state and a progressive switching behavior changes into a critical behavior, as the simplifying assumption is used. The present results clearly demonstrate the need for an accurate analytical equation for the total energy in predicting the thermal stability of nanostructured synthetic ferrimagnets.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalJournal of Magnetics
Volume15
Issue number3
DOIs
Publication statusPublished - 2010 Nov 29

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ferrimagnets
Energy barriers
Thermodynamic stability
thermal stability
Magnetic fields
magnetic fields
Magnetization
asymmetry
energy
dipoles
magnetization
Direction compound
configurations
cells

Keywords

  • Analytical equation for the total energy
  • Magnetic configuration
  • Magnetic energy barrier
  • Nanostructured cells
  • Synthetic ferrimagnets

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Thermal stability of nanostructured synthetic ferrimagnets under applied magnetic fields in the 45° direction. / Han, C. W.; Han, J. K.; Lim, Sang Ho.

In: Journal of Magnetics, Vol. 15, No. 3, 29.11.2010, p. 116-122.

Research output: Contribution to journalArticle

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