skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Insights into the magnetic dead layer in La0.7Sr0.3MnO3 thin films from temperature, magnetic field and thickness dependence of their magnetization

Journal Article · · AIP Advances
DOI:https://doi.org/10.1063/1.5005913· OSTI ID:1499105
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. West Virginia Univ., Morgantown, WV (United States)
+ Show Author Affiliations

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.

Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0016176
OSTI ID:
1499105
Alternate ID(s):
OSTI ID: 1416470
Journal Information:
AIP Advances, Vol. 8, Issue 5; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (23)

Hidden Magnetic Configuration in Epitaxial La 1 − x Sr x MnO 3 Films journal December 2010
Magnetism in dodecanethiol-capped gold nanoparticles: Role of size and capping agent journal May 2007
Magnetic relaxation and correlating effective magnetic moment with particle size distribution in maghemite nanoparticles journal June 2015
Ferromagnetism in Rare‐Earth Group VA and VIA Compounds with Th 3 P 4 Structure journal March 1964
Finite-size and surface effects in maghemite nanoparticles:  Monte Carlo simulations journal April 2001
Superparamagnetism and magnetic properties of Ni nanoparticles embedded in SiO 2 journal September 2002
Oxides, Oxides, and More Oxides: High-κ Oxides, Ferroelectrics, Ferromagnetics, and Multiferroics journal November 2009
Nickel-silica nanocomposite: Variation of the blocking temperature with magnetic field and measuring frequency journal April 2008
Thickness dependence of dynamic and static magnetic properties of pulsed laser deposited La0.7Sr0.3MnO3 films on SrTiO3(001) journal November 2014
Room temperature multiferroic effects in superlattice nanocapacitors journal December 2010
Impedance spectroscopy analysis of Ba 0.7 Sr 03 TiO 3 /La 0.7 Sr 0.3 MnO 3 heterostructure journal February 2011
Tuning the dead-layer behavior of La 0.67 Sr 0.33 MnO 3 /SrTiO 3 via interfacial engineering journal February 2014
Reversible Resistive Switching and Multilevel Recording in La 0.7 Sr 0.3 MnO 3 Thin Films for Low Cost Nonvolatile Memories journal October 2010
Size induced variations in structural and magnetic properties of double exchange La0.8Sr0.2MnO3−δ nano-ferromagnet journal July 2004
Size-dependent shifts of the Néel temperature and optical band-gap in NiO nanoparticles journal December 2013
Uniaxial Magnetic Anisotropy in La0.7Sr0.3MnO3 Thin Films Induced by Multiferroic BiFeO3 with Striped Ferroelectric Domains journal August 2010
The phenomenon of negative magnetization and its implications journal February 2015
Structural and magnetic characteristics of monodispersed Fe and oxide-coated Fe cluster assemblies journal September 2002
Magnetization Reversal and Asymmetry in Cobalt Vanadate (IV) journal February 1960
Crucial role played by interface and oxygen content in magnetic properties of ultrathin manganite films journal June 2013
Thickness dependence of dynamic and static magnetic properties of pulsed laser deposited La$_{0.7}$Sr$_{0.3}$MnO$_3$ films on SrTiO$_3$(001) text January 2014
Magnetic relaxation and correlating effective magnetic moment with particle size distribution in maghemite nanoparticles text January 2015
Finite-Size and surface effects in maghemite nanoparticles: Monte Carlo simulations text January 2001

Cited By (4)

Erratum: “Insights into the magnetic dead layer in La 0.7 Sr 0.3 Mn O3 thin films from temperature, magnetic field and thickness dependence of their magnetization” [AIP Advances 8, 056319 (2018)] journal February 2018
Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films journal September 2019
Observation and interpretation of negative remanent magnetization and inverted hysteresis loops in a thin film of La 0.7 Sr 0.3 MnO 3 journal September 2018
Effects of Oxygen Modification on the Structural and Magnetic Properties of Highly Epitaxial La0.7Sr0.3MnO3 (LSMO) thin films journal February 2020

Figures / Tables (3)

FIG. 1.(p. 4)figure FIG. 1.
FIG. 2.(p. 5)figure FIG. 2.
FIG. 3.(p. 6)figure FIG. 3.

Similar Records

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY