Dynamic configurational anisotropy in nanomagnets

V. V. Kruglyak, P. S. Keatley, R. J. Hicken, J. R. Childress, and J. A. Katine
Phys. Rev. B 75, 024407 – Published 5 January 2007

Abstract

The angular dependence of ultrafast magnetization dynamics in nanomagnets of square shape was studied by magneto-optical pump-probe measurements. In agreement with micromagnetic simulations, both the number of precessional modes and the values of their frequencies were observed to vary as the orientation of the external magnetic field was rotated in the element plane. We show that the observed behavior cannot be explained by the angular variation of the static effective magnetic field. Instead, it is found to originate from a new type of magnetic anisotropy—a dynamic configurational anisotropy, which is due to the variation of the dynamic effective magnetic field. Although always present, the dynamical anisotropy may dominate in nanoscale magnetic elements in which the static configurational anisotropy is suppressed.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 9 November 2006

DOI:https://doi.org/10.1103/PhysRevB.75.024407

©2007 American Physical Society

Authors & Affiliations

V. V. Kruglyak, P. S. Keatley, and R. J. Hicken

  • School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom

J. R. Childress and J. A. Katine

  • Hitachi Global Storage Technologies, San Jose Research Center, 650 Harry Road, San Jose, California 95120, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 75, Iss. 2 — 1 January 2007

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×