The magnetic and magnetotransport properties of Ni80Fe20/La0.7Sr0.3MnO3 (NiFe/LSMO) bilayers were investigated after bombarding the LSMO surface with low-energy Ar+ or O2+/Ar+ ion beams before the growth of the top NiFe layer. A variety of magnetic properties are revealed, including an asymmetric two-stepped hysteresis loop with an exchange bias loop shift, and alternatively, a symmetric two-stepped hysteresis loop with an enhanced coercivity. Polarized neutron reflectometry measurements provide details of the magnetic depth profile and interface layer magnetism at different temperatures. The LSMO surface modifications determine a complex magnetic and electric NiFe/LSMO interface having a strong effect on the magnetoresistance of the bilayer. Surface engineering based on ion beam bombardment is presented as a promising technique for optimizing the electronic and magnetic properties of NiFe/LSMO junctions for future device applications.
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14 November 2018
Research Article|
November 13 2018
Surface engineering with Ar+/O2+ ion beam bombardment: Tuning the electronic and magnetic behavior of Ni80Fe20/La0.7Sr0.3MnO3/SrTiO3(001) junctions
I. Bergenti
;
I. Bergenti
a)
1
Institute of Nanostructured Materials ISMN-CNR
, Via Gobetti 101, Bologna 40129, Italy
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P. K. Manna
;
P. K. Manna
2
Department of Physics and Astronomy, University of Manitoba
, Winnipeg R3T2N2, Canada
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C.-H. Lin;
C.-H. Lin
3
Department of Materials Science and Engineering, National Chung Hsing University
, Taichung 402, Taiwan
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P. Graziosi;
P. Graziosi
1
Institute of Nanostructured Materials ISMN-CNR
, Via Gobetti 101, Bologna 40129, Italy
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X. Liu;
X. Liu
b)
4
Australian Nuclear Science and Technology Organisation
, Lucas Heights, New South Wales 2234, Australia
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G. L. Causer
;
G. L. Causer
4
Australian Nuclear Science and Technology Organisation
, Lucas Heights, New South Wales 2234, Australia
5
Institute for Superconducting and Electronic Materials, University of Wollongong
, Wollongong, New South Wales 2500, Australia
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F. Liscio
;
F. Liscio
6
Institute for Microelectronics and Microsystems IMM-CNR
, Via Gobetti 101, 40129 Bologna, Italy
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A. Ruotolo;
A. Ruotolo
7
Department of Materials Science and Engineering, City University of Hong Kong
, Kowloon Tong, Hong Kong
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V. A. Dediu;
V. A. Dediu
1
Institute of Nanostructured Materials ISMN-CNR
, Via Gobetti 101, Bologna 40129, Italy
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J. van Lierop;
J. van Lierop
a)
2
Department of Physics and Astronomy, University of Manitoba
, Winnipeg R3T2N2, Canada
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F. Klose;
F. Klose
a)
4
Australian Nuclear Science and Technology Organisation
, Lucas Heights, New South Wales 2234, Australia
8
Guangdong Technion-Israel Institute of Technology
, Shantou 515063, People’s Republic of China
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a)
Electronic addresses: kwlin@dragon.nchu.edu.tw; frank.klose@gtiit.edu.cn; johan@physics.umanitoba.ca; and i.bergenti@bo.ismn.cnr.it
b)
Present address: Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
J. Appl. Phys. 124, 183903 (2018)
Article history
Received:
July 20 2018
Accepted:
October 29 2018
Citation
I. Bergenti, P. K. Manna, C.-H. Lin, P. Graziosi, X. Liu, G. L. Causer, F. Liscio, A. Ruotolo, V. A. Dediu, J. van Lierop, F. Klose, K.-W. Lin; Surface engineering with Ar+/O2+ ion beam bombardment: Tuning the electronic and magnetic behavior of Ni80Fe20/La0.7Sr0.3MnO3/SrTiO3(001) junctions. J. Appl. Phys. 14 November 2018; 124 (18): 183903. https://doi.org/10.1063/1.5049235
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