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Title: Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures

Abstract

In this study, we report on a shape-imposed magnetic anisotropy in micro- and nanostructures defined in antiferromagnetic (AF) LaFeO3 (LFO) thin films. Two distinct types of structures are investigated: embedded magnets created via ion implantation and free-standing magnets created via ion milling. Using a combination of x-ray photoemission electron microscopy and x-ray absorption spectroscopy, we examine the impact of the structure type, AF layer thickness, and crystal geometry on the Néel vector orientation in these structures. Here, we demonstrate a distinct shape-imposed anisotropy in embedded and free-standing structures alike and show that both parallel and perpendicular alignments of the AF spin axis with respect to structure edges can be achieved by variation of the AF layer thickness and the orientation of the structure edges with respect to the LFO crystalline axes. This work demonstrates how the fabrication procedure affects the magnetic order in thin film AF nanostructures and shows how nanoscale patterning can be used to control the orientation of the Néel vector in epitaxial oxide thin films.

Authors:
 [1];  [2]; ORCiD logo [3];  [1];  [1]; ORCiD logo [1];  [3];  [1];  [1]
  1. Norwegian Inst. of Science and Technology, Trondheim (Norway)
  2. Norwegian Inst. of Science and Technology, Trondheim (Norway); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Research Council of Norway
OSTI Identifier:
1656535
Grant/Contract Number:  
AC02-05CH11231; 231290; 221860/F60; 245963/F50
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 11; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Bang, A. D., Hallsteinsen, I., Chopdekar, R. V., Olsen, F. K., Slöetjes, S. D., Kjærnes, K., Arenholz, E., Folven, E., and Grepstad, J. K. Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures. United States: N. p., 2019. Web. https://doi.org/10.1063/1.5116806.
Bang, A. D., Hallsteinsen, I., Chopdekar, R. V., Olsen, F. K., Slöetjes, S. D., Kjærnes, K., Arenholz, E., Folven, E., & Grepstad, J. K. Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures. United States. https://doi.org/10.1063/1.5116806
Bang, A. D., Hallsteinsen, I., Chopdekar, R. V., Olsen, F. K., Slöetjes, S. D., Kjærnes, K., Arenholz, E., Folven, E., and Grepstad, J. K. Mon . "Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures". United States. https://doi.org/10.1063/1.5116806. https://www.osti.gov/servlets/purl/1656535.
@article{osti_1656535,
title = {Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures},
author = {Bang, A. D. and Hallsteinsen, I. and Chopdekar, R. V. and Olsen, F. K. and Slöetjes, S. D. and Kjærnes, K. and Arenholz, E. and Folven, E. and Grepstad, J. K.},
abstractNote = {In this study, we report on a shape-imposed magnetic anisotropy in micro- and nanostructures defined in antiferromagnetic (AF) LaFeO3 (LFO) thin films. Two distinct types of structures are investigated: embedded magnets created via ion implantation and free-standing magnets created via ion milling. Using a combination of x-ray photoemission electron microscopy and x-ray absorption spectroscopy, we examine the impact of the structure type, AF layer thickness, and crystal geometry on the Néel vector orientation in these structures. Here, we demonstrate a distinct shape-imposed anisotropy in embedded and free-standing structures alike and show that both parallel and perpendicular alignments of the AF spin axis with respect to structure edges can be achieved by variation of the AF layer thickness and the orientation of the structure edges with respect to the LFO crystalline axes. This work demonstrates how the fabrication procedure affects the magnetic order in thin film AF nanostructures and shows how nanoscale patterning can be used to control the orientation of the Néel vector in epitaxial oxide thin films.},
doi = {10.1063/1.5116806},
journal = {Applied Physics Letters},
number = 11,
volume = 115,
place = {United States},
year = {2019},
month = {9}
}

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