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

Title: NiO/Fe(001): Magnetic anisotropy, exchange bias, and interface structure

Abstract

The magnetic and structural properties of NiO/Fe epitaxial bilayers grown on MgO(001) were studied using magnetooptic Kerr effect (MOKE) and conversion electron Moessbauer spectroscopy (CEMS). The bilayers were prepared under ultra high vacuum conditions using molecular beam epitaxy with oblique deposition. Two systems were compared: one showing the exchange bias (100ML-NiO/24ML-Fe), ML stands for a monolayer, and another where the exchange bias was not observed (50ML-NiO/50ML-Fe). For both, the magnetic anisotropy was found to be complex, yet dominated by the growth-induced uniaxial anisotropy. The training effect was observed for the 100ML-NiO/24ML-Fe system and quantitatively described using the spin glass model. The composition and magnetic state of the interfacial Fe layers were studied using {sup 57}Fe-CEMS. An iron oxide phase (Fe{sup 3+}{sub 4}Fe{sup 2+}{sub 1}O{sub 7}), as thick as 31 A, was identified at the NiO/Fe interface in the as-deposited samples. The ferrimagnetic nature of the interfacial iron oxide film explains the complex magnetic anisotropy observed in the samples.

Authors:
 [1];  [2];  [2];  [1]
  1. Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow (Poland)
  2. S3, Istituto Nanoscienze-CNR, Via G. Campi 213/a, I-41125 Modena (Italy)
Publication Date:
OSTI Identifier:
22163059
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 113; Journal Issue: 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANISOTROPY; ELECTRON SPECTRA; EXCHANGE INTERACTIONS; FERRIMAGNETIC MATERIALS; FILMS; INTERFACES; IRON; IRON 57; IRON OXIDES; KERR EFFECT; LAYERS; MAGNESIUM OXIDES; MAGNETISM; MAGNETO-OPTICAL EFFECTS; MOESSBAUER EFFECT; MOLECULAR BEAM EPITAXY; NICKEL OXIDES; SPECTROSCOPY; SPIN GLASS STATE; VACUUM COATING

Citation Formats

Mlynczak, E., Luches, P., Valeri, S., Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universita di Modena e Reggio Emilia, Via G. Campi 213/a, 41100 Modena, Korecki, J., and Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al.Mickiewicza 30, 30-059 Krakow. NiO/Fe(001): Magnetic anisotropy, exchange bias, and interface structure. United States: N. p., 2013. Web. doi:10.1063/1.4811528.
Mlynczak, E., Luches, P., Valeri, S., Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universita di Modena e Reggio Emilia, Via G. Campi 213/a, 41100 Modena, Korecki, J., & Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al.Mickiewicza 30, 30-059 Krakow. NiO/Fe(001): Magnetic anisotropy, exchange bias, and interface structure. United States. https://doi.org/10.1063/1.4811528
Mlynczak, E., Luches, P., Valeri, S., Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universita di Modena e Reggio Emilia, Via G. Campi 213/a, 41100 Modena, Korecki, J., and Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al.Mickiewicza 30, 30-059 Krakow. 2013. "NiO/Fe(001): Magnetic anisotropy, exchange bias, and interface structure". United States. https://doi.org/10.1063/1.4811528.
@article{osti_22163059,
title = {NiO/Fe(001): Magnetic anisotropy, exchange bias, and interface structure},
author = {Mlynczak, E. and Luches, P. and Valeri, S. and Dipartimento di Scienze Fisiche, Matematiche e Informatiche, Universita di Modena e Reggio Emilia, Via G. Campi 213/a, 41100 Modena and Korecki, J. and Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al.Mickiewicza 30, 30-059 Krakow},
abstractNote = {The magnetic and structural properties of NiO/Fe epitaxial bilayers grown on MgO(001) were studied using magnetooptic Kerr effect (MOKE) and conversion electron Moessbauer spectroscopy (CEMS). The bilayers were prepared under ultra high vacuum conditions using molecular beam epitaxy with oblique deposition. Two systems were compared: one showing the exchange bias (100ML-NiO/24ML-Fe), ML stands for a monolayer, and another where the exchange bias was not observed (50ML-NiO/50ML-Fe). For both, the magnetic anisotropy was found to be complex, yet dominated by the growth-induced uniaxial anisotropy. The training effect was observed for the 100ML-NiO/24ML-Fe system and quantitatively described using the spin glass model. The composition and magnetic state of the interfacial Fe layers were studied using {sup 57}Fe-CEMS. An iron oxide phase (Fe{sup 3+}{sub 4}Fe{sup 2+}{sub 1}O{sub 7}), as thick as 31 A, was identified at the NiO/Fe interface in the as-deposited samples. The ferrimagnetic nature of the interfacial iron oxide film explains the complex magnetic anisotropy observed in the samples.},
doi = {10.1063/1.4811528},
url = {https://www.osti.gov/biblio/22163059}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 23,
volume = 113,
place = {United States},
year = {Fri Jun 21 00:00:00 EDT 2013},
month = {Fri Jun 21 00:00:00 EDT 2013}
}