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Title: Asymmetry in Time Evolution of Magnetization in Magnetic Nanostructures

Abstract

Strong interest in nanomagnetism stems from the promise of high storage densities of information through control of ever smaller and smaller ensembles of spins. There is a broad consensus that the Landau-Lifshitz-Gilbert equation reliably describes the magnetization dynamics on classical phenomenological level. On the other hand, it is not so evident that the magnetization dynamics governed by this equation contains built-in asymmetry in the case of broad topology sets of symmetric total energy functional surfaces. The magnetization dynamics in such cases shows preference for one particular state from many energetically equivalent available minima. Here, we demonstrate this behavior on a simple one-spin model which can be treated analytically. Depending on the ferromagnet geometry and material parameters, this asymmetric behavior can be robust enough to survive even at high temperatures opening simplified venues for controlling magnetic states of nanodevices in practical applications. Using micromagnetic simulations we demonstrate the asymmetry in magnetization dynamics in a real system with reduced symmetry such as Pacman-like nanodot. Finally, exploiting the built-in asymmetry in the dynamics could lead to practical methods of preparing desired spin configurations on nanoscale. Introduction

Authors:
 [1];  [1];  [2]
  1. Slovak Academy of Sciences, Bratislava (Slovakia). Inst. of Electrical Engineering
  2. Drexel Univ., Philadelphia, PA (United States). Department of Physics
Publication Date:
Research Org.:
Drexel Univ., Philadelphia, PA (United States); Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Center for the Computational Design of Functional Layered Materials (CCDM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1347095
Alternate Identifier(s):
OSTI ID: 1387323
Grant/Contract Number:  
SC0012575; APVV-0088-12
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Coarse-grained models; Magnetic properties and materials; catalysis (heterogeneous); solar (photovoltaic); energy storage (including batteries and capacitors); hydrogen and fuel cells; defects; mechanical behavior; materials and chemistry by design; synthesis novel materials)

Citation Formats

Tóbik, Jaroslav, Cambel, Vladimir, and Karapetrov, Goran. Asymmetry in Time Evolution of Magnetization in Magnetic Nanostructures. United States: N. p., 2015. Web. doi:10.1038/srep12301.
Tóbik, Jaroslav, Cambel, Vladimir, & Karapetrov, Goran. Asymmetry in Time Evolution of Magnetization in Magnetic Nanostructures. United States. doi:10.1038/srep12301.
Tóbik, Jaroslav, Cambel, Vladimir, and Karapetrov, Goran. Wed . "Asymmetry in Time Evolution of Magnetization in Magnetic Nanostructures". United States. doi:10.1038/srep12301. https://www.osti.gov/servlets/purl/1347095.
@article{osti_1347095,
title = {Asymmetry in Time Evolution of Magnetization in Magnetic Nanostructures},
author = {Tóbik, Jaroslav and Cambel, Vladimir and Karapetrov, Goran},
abstractNote = {Strong interest in nanomagnetism stems from the promise of high storage densities of information through control of ever smaller and smaller ensembles of spins. There is a broad consensus that the Landau-Lifshitz-Gilbert equation reliably describes the magnetization dynamics on classical phenomenological level. On the other hand, it is not so evident that the magnetization dynamics governed by this equation contains built-in asymmetry in the case of broad topology sets of symmetric total energy functional surfaces. The magnetization dynamics in such cases shows preference for one particular state from many energetically equivalent available minima. Here, we demonstrate this behavior on a simple one-spin model which can be treated analytically. Depending on the ferromagnet geometry and material parameters, this asymmetric behavior can be robust enough to survive even at high temperatures opening simplified venues for controlling magnetic states of nanodevices in practical applications. Using micromagnetic simulations we demonstrate the asymmetry in magnetization dynamics in a real system with reduced symmetry such as Pacman-like nanodot. Finally, exploiting the built-in asymmetry in the dynamics could lead to practical methods of preparing desired spin configurations on nanoscale. Introduction},
doi = {10.1038/srep12301},
journal = {Scientific Reports},
number = 1,
volume = 5,
place = {United States},
year = {2015},
month = {7}
}

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