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Title: Magnetic coupling of vortices in a two-dimensional lattice

Abstract

In this study, we investigated the magnetization reversal of magnetic vortex structures in a two-dimensional lattice. The structures were formed by permalloy (Py) film deposition onto large arrays of self-assembled spherical SiO 2-particles with a diameter of 330 nm. We present the dependence of the nucleation and annihilation field of the vortex structures as a function of the Py layer thickness (aspect ratio) and temperature. By increasing the Py thickness up to 90 nm or alternatively by lowering the temperature the vortex structure becomes more stable as expected. However, the increase of the Py thickness results in the onset of strong exchange coupling between neighboring Py caps due to the emergence of Py bridges connecting them. In particular, we studied the influence of magnetic coupling locally by in-field scanning magneto-resistive microscopy and full-field magnetic soft x-ray microscopy, revealing a domain-like nucleation process of vortex states, which arises via domain wall propagation due to exchange coupling of the closely packed structures. By analyzing the rotation sense of the reversed areas, large connected domains are present with the same circulation sense. Furthermore, the lateral core displacements when an in-plane field is applied were investigated, revealing spatially enlarged vortex cores and a broadermore » distribution with increasing Py layer thickness. Additionally, the presence of some mixed states, vortices and c-states, is indicated for the array with the thickest Py layer.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [1]
  1. Univ. of Augsburg (Germany)
  2. Chemnitz Univ. of Technology (Germany)
  3. National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram (India)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Daegu Gyeongbuk Institute of Science and Technology (Korea)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1530209
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nanotechnology
Additional Journal Information:
Journal Volume: 26; Journal Issue: 46; Journal ID: ISSN 0957-4484
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Nissen, D., Mitin, D., Klein, O., Arekapudi, S. S. P. K., Thomas, S., Im, M-Y, Fischer, P., and Albrecht, M. Magnetic coupling of vortices in a two-dimensional lattice. United States: N. p., 2015. Web. doi:10.1088/0957-4484/26/46/465706.
Nissen, D., Mitin, D., Klein, O., Arekapudi, S. S. P. K., Thomas, S., Im, M-Y, Fischer, P., & Albrecht, M. Magnetic coupling of vortices in a two-dimensional lattice. United States. doi:10.1088/0957-4484/26/46/465706.
Nissen, D., Mitin, D., Klein, O., Arekapudi, S. S. P. K., Thomas, S., Im, M-Y, Fischer, P., and Albrecht, M. Thu . "Magnetic coupling of vortices in a two-dimensional lattice". United States. doi:10.1088/0957-4484/26/46/465706. https://www.osti.gov/servlets/purl/1530209.
@article{osti_1530209,
title = {Magnetic coupling of vortices in a two-dimensional lattice},
author = {Nissen, D. and Mitin, D. and Klein, O. and Arekapudi, S. S. P. K. and Thomas, S. and Im, M-Y and Fischer, P. and Albrecht, M.},
abstractNote = {In this study, we investigated the magnetization reversal of magnetic vortex structures in a two-dimensional lattice. The structures were formed by permalloy (Py) film deposition onto large arrays of self-assembled spherical SiO2-particles with a diameter of 330 nm. We present the dependence of the nucleation and annihilation field of the vortex structures as a function of the Py layer thickness (aspect ratio) and temperature. By increasing the Py thickness up to 90 nm or alternatively by lowering the temperature the vortex structure becomes more stable as expected. However, the increase of the Py thickness results in the onset of strong exchange coupling between neighboring Py caps due to the emergence of Py bridges connecting them. In particular, we studied the influence of magnetic coupling locally by in-field scanning magneto-resistive microscopy and full-field magnetic soft x-ray microscopy, revealing a domain-like nucleation process of vortex states, which arises via domain wall propagation due to exchange coupling of the closely packed structures. By analyzing the rotation sense of the reversed areas, large connected domains are present with the same circulation sense. Furthermore, the lateral core displacements when an in-plane field is applied were investigated, revealing spatially enlarged vortex cores and a broader distribution with increasing Py layer thickness. Additionally, the presence of some mixed states, vortices and c-states, is indicated for the array with the thickest Py layer.},
doi = {10.1088/0957-4484/26/46/465706},
journal = {Nanotechnology},
number = 46,
volume = 26,
place = {United States},
year = {2015},
month = {10}
}

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Cited by: 6 works
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