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Title: Insights into the magnetic dead layer in La 0.7Sr 0.3MnO 3 thin films from temperature, magnetic field and thickness dependence of their magnetization

Abstract

Experimental investigations of the magnetic dead layer in 7.6 nm thick film of La 0.7Sr 0.3MnO 3 (LSMO) are reported. The dc magnetization ( M) measurements for a sample cooled to T = 5 K in applied field H = 0 reveal the presence of negative remanent magnetization (NRM) in the M vs. H (magnetic field) measurements as well as in the M vs. T measurements in H = 50 Oe and 100 Oe. The M vs. T data in ZFC (zero-field-cooled) and FC (field-cooled) protocols are used to determine the blocking temperature TB in different H. Isothermal hysteresis loops at different T are used to determine the temperature dependence of saturation magnetization ( MS), remanence (MR) and coercivity HC. The MS vs. T data are fit to the Bloch law, MS ( T) = M0 ( 1 – BT 3/2), showing a good fit for T < 100 K and yielding the nearest-neighbor exchange constant J/kB ≅ 18 K. The variations of TB vs. H and HC vs. T are well described by the model often used for randomly oriented magnetic nanoparticles with magnetic domain diameter ≈ 9 nm present in the dead-layer of thickness d =1.4 nm. Finally,more » the data available from literature on the thickness ( D) variation of Curie temperature ( TC) and MS of LSMO films grown under 200, 150, and 0.38 mTorr pressures of O 2 are analyzed in terms of the finite-size scaling, with MS vs. D data fit to MS ( D) = MS (b)(1-d/ D) yielding the dead layer thickness d = 1.1 nm, 1.4 nm and 2.4 nm respectively. Brief discussion on the significance of these results is presented.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. West Virginia Univ., Morgantown, WV (United States)
Publication Date:
Research Org.:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1499105
Alternate Identifier(s):
OSTI ID: 1416470
Grant/Contract Number:  
SC0016176
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Mottaghi, N., Seehra, M. S., Trappen, R., Kumari, S., Huang, Chih-Yeh, Yousefi, S., Cabrera, G. B., Romero, A. H., and Holcomb, M. B. Insights into the magnetic dead layer in La0.7Sr0.3MnO3 thin films from temperature, magnetic field and thickness dependence of their magnetization. United States: N. p., 2018. Web. doi:10.1063/1.5005913.
Mottaghi, N., Seehra, M. S., Trappen, R., Kumari, S., Huang, Chih-Yeh, Yousefi, S., Cabrera, G. B., Romero, A. H., & Holcomb, M. B. Insights into the magnetic dead layer in La0.7Sr0.3MnO3 thin films from temperature, magnetic field and thickness dependence of their magnetization. United States. doi:10.1063/1.5005913.
Mottaghi, N., Seehra, M. S., Trappen, R., Kumari, S., Huang, Chih-Yeh, Yousefi, S., Cabrera, G. B., Romero, A. H., and Holcomb, M. B. Wed . "Insights into the magnetic dead layer in La0.7Sr0.3MnO3 thin films from temperature, magnetic field and thickness dependence of their magnetization". United States. doi:10.1063/1.5005913. https://www.osti.gov/servlets/purl/1499105.
@article{osti_1499105,
title = {Insights into the magnetic dead layer in La0.7Sr0.3MnO3 thin films from temperature, magnetic field and thickness dependence of their magnetization},
author = {Mottaghi, N. and Seehra, M. S. and Trappen, R. and Kumari, S. and Huang, Chih-Yeh and Yousefi, S. and Cabrera, G. B. and Romero, A. H. and Holcomb, M. B.},
abstractNote = {Experimental investigations of the magnetic dead layer in 7.6 nm thick film of La0.7Sr0.3MnO3 (LSMO) are reported. The dc magnetization (M) measurements for a sample cooled to T = 5 K in applied field H = 0 reveal the presence of negative remanent magnetization (NRM) in the M vs. H (magnetic field) measurements as well as in the M vs. T measurements in H = 50 Oe and 100 Oe. The M vs. T data in ZFC (zero-field-cooled) and FC (field-cooled) protocols are used to determine the blocking temperature TB in different H. Isothermal hysteresis loops at different T are used to determine the temperature dependence of saturation magnetization (MS), remanence (MR) and coercivity HC. The MS vs. T data are fit to the Bloch law, MS (T) = M0 (1 – BT3/2), showing a good fit for T < 100 K and yielding the nearest-neighbor exchange constant J/kB ≅ 18 K. The variations of TB vs. H and HC vs. T are well described by the model often used for randomly oriented magnetic nanoparticles with magnetic domain diameter ≈ 9 nm present in the dead-layer of thickness d =1.4 nm. Finally, the data available from literature on the thickness (D) variation of Curie temperature (TC) and MS of LSMO films grown under 200, 150, and 0.38 mTorr pressures of O2 are analyzed in terms of the finite-size scaling, with MS vs. D data fit to MS (D) = MS(b)(1-d/D) yielding the dead layer thickness d = 1.1 nm, 1.4 nm and 2.4 nm respectively. Brief discussion on the significance of these results is presented.},
doi = {10.1063/1.5005913},
journal = {AIP Advances},
issn = {2158-3226},
number = 5,
volume = 8,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1. FIG. 1. : Magnetization vs. temperature data for the 7.6 nm LSMO/STO sample measured with $H$ = 50, 100, 200, 500 Oe and 1 kOe. Arrows mark the bifurcation temperature $T$$B$ separating the $M$ (FC) data (open red circles) from the $M$ (ZFC) data (closed blue circles). $T$$C$ is themore » Curie temperature.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.