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Title: Suppressed magnetization at the surfaces and interfaces of ferromagnetic metallic manganites.

Abstract

What happens to ferromagnetism at the surfaces and interfaces of manganites? With the competition between charge, spin, and orbital degrees of freedom, it is not surprising that the surface behavior may be profoundly different to that of the bulk. Using a powerful combination of two surface probes, tunneling and polarized x-ray interactions, this paper reviews our work on the nature of the electronic and magnetic states at manganite surfaces and interfaces. The general observation is that ferromagnetism is not the lowest energy state at the surface or interface, which results in a suppression or even loss of ferromagnetic order at the surface. Two cases will be discussed ranging from the surface of the quasi-2D bilayer manganite (La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7}) to the 3D perovskite (La{sub 2/3}Sr{sub 1/3}MnO{sub 3})/SrTiO{sub 3} interface. For the bilayer manganite, which is ferromagnetic and conducting in the bulk, these probes present clear evidence for an intrinsic insulating non-ferromagnetic surface layer atop adjacent subsurface layers that display the full bulk magnetization. This abrupt intrinsic magnetic interface is attributed to the weak inter-bilayer coupling native to these quasi-two-dimensional materials. This is in marked contrast to the situation for the non-layered manganite system (La{sub 2/3}Sr{sub 1/3}MnO{sub 3}/SrTiO{sub 3}),more » whose magnetization near the interface is less than half the bulk value at low temperatures and decreases with increasing temperature at a faster rate than that for the bulk.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
917687
Report Number(s):
ANL/XSD/JA-57964
TRN: US200817%%684
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
J. Phys.: Cond. Matter
Additional Journal Information:
Journal Volume: 19; Journal Issue: Jul. 3, 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; FERROMAGNETISM; MAGNETIZATION; PEROVSKITE; INTERFACES; LANTHANUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; TITANIUM OXIDES; SURFACES

Citation Formats

Freeland, J W, Kavich, J J, Gray, K E, Ozyuzer, L, Zheng, H, Mitchell, J F, Warusawithana, M P, Ryan, P, Zhai, X, Kodama, R H, Eckstein, J N, Univ. of Illinois at Chicago, and Univ. of Illinois. Suppressed magnetization at the surfaces and interfaces of ferromagnetic metallic manganites.. United States: N. p., 2007. Web. doi:10.1088/0953-8984/19/31/315210.
Freeland, J W, Kavich, J J, Gray, K E, Ozyuzer, L, Zheng, H, Mitchell, J F, Warusawithana, M P, Ryan, P, Zhai, X, Kodama, R H, Eckstein, J N, Univ. of Illinois at Chicago, & Univ. of Illinois. Suppressed magnetization at the surfaces and interfaces of ferromagnetic metallic manganites.. United States. doi:10.1088/0953-8984/19/31/315210.
Freeland, J W, Kavich, J J, Gray, K E, Ozyuzer, L, Zheng, H, Mitchell, J F, Warusawithana, M P, Ryan, P, Zhai, X, Kodama, R H, Eckstein, J N, Univ. of Illinois at Chicago, and Univ. of Illinois. Tue . "Suppressed magnetization at the surfaces and interfaces of ferromagnetic metallic manganites.". United States. doi:10.1088/0953-8984/19/31/315210.
@article{osti_917687,
title = {Suppressed magnetization at the surfaces and interfaces of ferromagnetic metallic manganites.},
author = {Freeland, J W and Kavich, J J and Gray, K E and Ozyuzer, L and Zheng, H and Mitchell, J F and Warusawithana, M P and Ryan, P and Zhai, X and Kodama, R H and Eckstein, J N and Univ. of Illinois at Chicago and Univ. of Illinois},
abstractNote = {What happens to ferromagnetism at the surfaces and interfaces of manganites? With the competition between charge, spin, and orbital degrees of freedom, it is not surprising that the surface behavior may be profoundly different to that of the bulk. Using a powerful combination of two surface probes, tunneling and polarized x-ray interactions, this paper reviews our work on the nature of the electronic and magnetic states at manganite surfaces and interfaces. The general observation is that ferromagnetism is not the lowest energy state at the surface or interface, which results in a suppression or even loss of ferromagnetic order at the surface. Two cases will be discussed ranging from the surface of the quasi-2D bilayer manganite (La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7}) to the 3D perovskite (La{sub 2/3}Sr{sub 1/3}MnO{sub 3})/SrTiO{sub 3} interface. For the bilayer manganite, which is ferromagnetic and conducting in the bulk, these probes present clear evidence for an intrinsic insulating non-ferromagnetic surface layer atop adjacent subsurface layers that display the full bulk magnetization. This abrupt intrinsic magnetic interface is attributed to the weak inter-bilayer coupling native to these quasi-two-dimensional materials. This is in marked contrast to the situation for the non-layered manganite system (La{sub 2/3}Sr{sub 1/3}MnO{sub 3}/SrTiO{sub 3}), whose magnetization near the interface is less than half the bulk value at low temperatures and decreases with increasing temperature at a faster rate than that for the bulk.},
doi = {10.1088/0953-8984/19/31/315210},
journal = {J. Phys.: Cond. Matter},
number = Jul. 3, 2007,
volume = 19,
place = {United States},
year = {2007},
month = {7}
}