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Title: Observation and elimination of broken symmetry in L1{sub 0} FePt nanostructures

Abstract

An unexplained surface anisotropy effect was observed and confirmed in the magnetization reversal process of both L1{sub 0} phase FePt nanoparticles with octahedral shape and (001) textured L1{sub 0} FePt thin films with island nanostructures. We suggest that the nature of the observed surface effect is caused by broken symmetry on the FePt surface, which results in weakened exchange coupling for surface atoms. Furthermore, we propose, and experimentally demonstrate, a method to repair the broken symmetry by capping the FePt islands with a Pt layer, which could prove invaluable in understanding fundamental limitations of magnetic nanostructures.

Authors:
; ; ; ; ;  [1];  [2]
  1. Department of Electrical and Computer Engineering and the Center for Micromagnetics and Information Technologies (MINT), University of Minnesota, Minnesota 55455 (United States)
  2. Department of Optical Science and Engineering, Fudan University, Shanghai (China)
Publication Date:
OSTI Identifier:
22486192
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; COUPLING; LAYERS; MAGNETIZATION; NANOPARTICLES; NANOSTRUCTURES; SURFACES; SYMMETRY BREAKING; THIN FILMS

Citation Formats

Quarterman, P., Wang, Hao, Qiu, Jiao-Ming, Ma, Bin, Liu, Xiaoqi, Wang, Jian-Ping, and Guo, Honghua. Observation and elimination of broken symmetry in L1{sub 0} FePt nanostructures. United States: N. p., 2015. Web. doi:10.1063/1.4936933.
Quarterman, P., Wang, Hao, Qiu, Jiao-Ming, Ma, Bin, Liu, Xiaoqi, Wang, Jian-Ping, & Guo, Honghua. Observation and elimination of broken symmetry in L1{sub 0} FePt nanostructures. United States. https://doi.org/10.1063/1.4936933
Quarterman, P., Wang, Hao, Qiu, Jiao-Ming, Ma, Bin, Liu, Xiaoqi, Wang, Jian-Ping, and Guo, Honghua. 2015. "Observation and elimination of broken symmetry in L1{sub 0} FePt nanostructures". United States. https://doi.org/10.1063/1.4936933.
@article{osti_22486192,
title = {Observation and elimination of broken symmetry in L1{sub 0} FePt nanostructures},
author = {Quarterman, P. and Wang, Hao and Qiu, Jiao-Ming and Ma, Bin and Liu, Xiaoqi and Wang, Jian-Ping and Guo, Honghua},
abstractNote = {An unexplained surface anisotropy effect was observed and confirmed in the magnetization reversal process of both L1{sub 0} phase FePt nanoparticles with octahedral shape and (001) textured L1{sub 0} FePt thin films with island nanostructures. We suggest that the nature of the observed surface effect is caused by broken symmetry on the FePt surface, which results in weakened exchange coupling for surface atoms. Furthermore, we propose, and experimentally demonstrate, a method to repair the broken symmetry by capping the FePt islands with a Pt layer, which could prove invaluable in understanding fundamental limitations of magnetic nanostructures.},
doi = {10.1063/1.4936933},
url = {https://www.osti.gov/biblio/22486192}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 23,
volume = 107,
place = {United States},
year = {Mon Dec 07 00:00:00 EST 2015},
month = {Mon Dec 07 00:00:00 EST 2015}
}