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Title: Surface-induced phenomena in uncompensated collinear antiferromagnets

Abstract

The net spontaneous magnetization of antiferromagnets with modified surfaces was computed using mean-field theory. For ordinary phase transitions the net magnetization of uncompensated AFM is smaller than the surface magnetization and the Néel vector, whereas for extraordinary phase transitions the net magnetization is larger than the surface magnetization and the Néel vector at finite temperature. Moreover, the temperature dependence of these three observable internal parameters changes drastically with the surface properties, i.e. the surface exchange coupling JS. Based on these findings, contour plots showing different regions of magnetization and Néel vector behavior as functions of temperature and surface exchange strength are proposed.

Authors:
 [1];  [1]
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  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
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:
1512174
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 27; Journal Issue: 8; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; antiferromagnet; surface; order parameter

Citation Formats

Charilaou, M., and Hellman, F. Surface-induced phenomena in uncompensated collinear antiferromagnets. United States: N. p., 2015. Web. doi:10.1088/0953-8984/27/8/086001.
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Charilaou, M., & Hellman, F. Surface-induced phenomena in uncompensated collinear antiferromagnets. United States. https://doi.org/10.1088/0953-8984/27/8/086001
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Charilaou, M., and Hellman, F. Thu . "Surface-induced phenomena in uncompensated collinear antiferromagnets". United States. https://doi.org/10.1088/0953-8984/27/8/086001. https://www.osti.gov/servlets/purl/1512174.
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@article{osti_1512174,
title = {Surface-induced phenomena in uncompensated collinear antiferromagnets},
author = {Charilaou, M. and Hellman, F.},
abstractNote = {The net spontaneous magnetization of antiferromagnets with modified surfaces was computed using mean-field theory. For ordinary phase transitions the net magnetization of uncompensated AFM is smaller than the surface magnetization and the Néel vector, whereas for extraordinary phase transitions the net magnetization is larger than the surface magnetization and the Néel vector at finite temperature. Moreover, the temperature dependence of these three observable internal parameters changes drastically with the surface properties, i.e. the surface exchange coupling JS. Based on these findings, contour plots showing different regions of magnetization and Néel vector behavior as functions of temperature and surface exchange strength are proposed.},
doi = {10.1088/0953-8984/27/8/086001},
journal = {Journal of Physics. Condensed Matter},
number = 8,
volume = 27,
place = {United States},
year = {Thu Feb 05 00:00:00 EST 2015},
month = {Thu Feb 05 00:00:00 EST 2015}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/0953-8984/27/8/086001
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Cited by: 2 works
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Figures / Tables:

Figure 1 Figure 1: Illustration of the magnetization profile in AFM films with the Néel vector (staggered magnetization) perpendicular to the film plane. The arrows show the direction of the magnetic moment in each atomic plane, whereas we distinguish between two cases: ($a$) the magnetization on the surface is weaker due tomore » lesser coordination, and ($b$) the magnetization on the surface is stronger due to enhanced pair-wise exchange coupling. The size of the arrows corresponds to the magnetization of each atomic plane, and their relative size is to scale for $T$ = 0.95$T$N. The net magnetization, i.e. the sum of all moments, is not equal to the surface moment due to the magnetization profile.« less
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