Hysteresis multicycles in nanomagnet arrays

J. M. Deutsch, Trieu Mai, and Onuttom Narayan
Phys. Rev. E 71, 026120 – Published 23 February 2005

Abstract

We predict two physical effects in arrays of single-domain nanomagnets by performing simulations using a realistic model Hamiltonian and physical parameters. First, we find hysteretic multicycles for such nanomagnets. The simulation uses continuous spin dynamics through the Landau-Lifshitz-Gilbert (LLG) equation. In some regions of parameter space, the probability of finding a multicycle is as high as 0.6. We find that systems with larger and more anisotropic nanomagnets tend to display more multicycles. Our results also demonstrate the importance of disorder and frustration for multicycle behavior. Second, we show that there is a fundamental difference between the more realistic vector LLG equation and scalar models of hysteresis, such as Ising models. In the latter case spin and external field inversion symmetry is obeyed, but in the former it is destroyed by the dynamics, with important experimental implications.

  • Figure
  • Figure
  • Received 14 September 2004

DOI:https://doi.org/10.1103/PhysRevE.71.026120

©2005 American Physical Society

Authors & Affiliations

J. M. Deutsch, Trieu Mai, and Onuttom Narayan

  • Department of Physics, University of California, Santa Cruz, California 95064, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 71, Iss. 2 — February 2005

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 E

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×