Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures

Abstract We report zero-field-cooled spontaneous-positive and field-cooled conventional-negative exchange bias effects in epitaxial bilayer composed of La0.7Sr0.3MnO3 (LSMO) with ferromagnetic (FM) and Eu0.45Sr0.55MnO3 (ESMO) with A-type antiferromagnetic (AF) heterostructures respectively. A temper...

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Autores principales:	J. Krishna Murthy, P. S. Anil Kumar
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6a443c53aeb44883b797520e45b2c92d
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spelling	oai:doaj.org-article:6a443c53aeb44883b797520e45b2c92d2021-12-02T12:31:53ZInterface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures10.1038/s41598-017-07033-x2045-2322https://doaj.org/article/6a443c53aeb44883b797520e45b2c92d2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07033-xhttps://doaj.org/toc/2045-2322Abstract We report zero-field-cooled spontaneous-positive and field-cooled conventional-negative exchange bias effects in epitaxial bilayer composed of La0.7Sr0.3MnO3 (LSMO) with ferromagnetic (FM) and Eu0.45Sr0.55MnO3 (ESMO) with A-type antiferromagnetic (AF) heterostructures respectively. A temperature dependent magnetization study of LSMO/ESMO bilayers grown on SrTiO3 (001) manifest FM ordering (TC) of LSMO at ~320 K, charge/orbital ordering of ESMO at ~194 K and AF ordering (TN) of ESMO at ~150 K. The random field Ising model has demonstrated an interesting observation of inverse dependence of exchange bias effect on AF layer thickness due to the competition between FM-AF interface coupling and AF domain wall energy. The isothermally field induced unidirectional exchange anisotropy formed at the interface of FM-LSMO layer and the kinetically phase-arrested magnetic phase obtained from the metamagnetic AF-ESMO layer could be responsible for the spontaneous exchange bias effect. Importantly, no magnetic poling is needed, as necessary for the applications. The FM-AF interface exchange interaction has been ascribed to the AF coupling with $$\sum {J}_{ex}\vec{{S}_{{\rm{FM}}}}\cdot \vec{{S}_{{\rm{AF}}}}$$ ∑JexSFM⃗⋅SAF⃗ ($${J}_{ex}\approx {J}_{AF}$$ Jex≈JAF , coupling constant between AF spins) for the spontaneous positive hysteresis loop shift, and the field-cooled conventional exchange bias has been attributed to the ferromagnetically exchanged interface with $${J}_{ex}\approx {J}_{F}$$ Jex≈JF (coupling constant between FM spins).J. Krishna MurthyP. S. Anil KumarNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. Krishna Murthy P. S. Anil Kumar Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures
description	Abstract We report zero-field-cooled spontaneous-positive and field-cooled conventional-negative exchange bias effects in epitaxial bilayer composed of La0.7Sr0.3MnO3 (LSMO) with ferromagnetic (FM) and Eu0.45Sr0.55MnO3 (ESMO) with A-type antiferromagnetic (AF) heterostructures respectively. A temperature dependent magnetization study of LSMO/ESMO bilayers grown on SrTiO3 (001) manifest FM ordering (TC) of LSMO at ~320 K, charge/orbital ordering of ESMO at ~194 K and AF ordering (TN) of ESMO at ~150 K. The random field Ising model has demonstrated an interesting observation of inverse dependence of exchange bias effect on AF layer thickness due to the competition between FM-AF interface coupling and AF domain wall energy. The isothermally field induced unidirectional exchange anisotropy formed at the interface of FM-LSMO layer and the kinetically phase-arrested magnetic phase obtained from the metamagnetic AF-ESMO layer could be responsible for the spontaneous exchange bias effect. Importantly, no magnetic poling is needed, as necessary for the applications. The FM-AF interface exchange interaction has been ascribed to the AF coupling with $$\sum {J}_{ex}\vec{{S}_{{\rm{FM}}}}\cdot \vec{{S}_{{\rm{AF}}}}$$ ∑JexSFM⃗⋅SAF⃗ ($${J}_{ex}\approx {J}_{AF}$$ Jex≈JAF , coupling constant between AF spins) for the spontaneous positive hysteresis loop shift, and the field-cooled conventional exchange bias has been attributed to the ferromagnetically exchanged interface with $${J}_{ex}\approx {J}_{F}$$ Jex≈JF (coupling constant between FM spins).
format	article
author	J. Krishna Murthy P. S. Anil Kumar
author_facet	J. Krishna Murthy P. S. Anil Kumar
author_sort	J. Krishna Murthy
title	Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures
title_short	Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures
title_full	Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures
title_fullStr	Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures
title_full_unstemmed	Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures
title_sort	interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer la0.7sr0.3mno3/eu0.45sr0.55mno3 heterostructures
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/6a443c53aeb44883b797520e45b2c92d
work_keys_str_mv	AT jkrishnamurthy interfaceinducedspontaneouspositiveandconventionalnegativeexchangebiaseffectsinbilayerla07sr03mno3eu045sr055mno3heterostructures AT psanilkumar interfaceinducedspontaneouspositiveandconventionalnegativeexchangebiaseffectsinbilayerla07sr03mno3eu045sr055mno3heterostructures
_version_	1718394218902192128

Interface-induced spontaneous positive and conventional negative exchange bias effects in bilayer La0.7Sr0.3MnO3/Eu0.45Sr0.55MnO3 heterostructures

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