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000872955 245__ $$aImpact of growth kinetics on the interface morphology and magnetization in La 1/3 Sr 2/3 FeO 3 /La 2/3 Sr 1/3 MnO 3 heterostructures
000872955 260__ $$aBristol$$bIOP Publ.$$c2020
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000872955 520__ $$aThe ability to create atomically perfect, epitaxial heterostructures of correlated complex perovskite oxides using state-of-art thin film deposition techniques has generated new physical phenomena at engineered interfaces. Here we report on the impact of growth kinetics on the magnetic structure and exchange coupling at the interface in heterostructures combining layers of antiferromagnetic La1/3Sr2/3FeO3 (LSFO) and ferromagnetic La2/3Sr1/3MnO3 (LSMO) on (0 0 1)-oriented SrTiO3 (STO) substrates. Two growth orders are investigated, (a) LSMO/LSFO/STO(0 0 1) and (b) LSFO/LSMO/STO(0 0 1), where the LSFO layer is grown by molecular beam epitaxy and the LSMO layer by high oxygen pressure sputtering. The interface has been investigated using electron microscopy and polarized neutron reflectometry. Interdiffusion over seven monolayers is observed in LSMO/LSFO (a) with an almost 50% reduction in magnetization at the interface and showing no exchange coupling. However, the exchange bias effect ( mT at 10 K) could be realized when the interface is atomically sharp, as in LSFO/LSMO (b). Our study therefore reveals that, even for well ordered and lattice-matched structures, the kinetics involved in the growth processes drastically influences the interface quality with a strong correlation to the magnetic properties.
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000872955 7001_ $$0P:(DE-Juel1)172634$$aSarkar, A.$$b1$$eCorresponding author
000872955 7001_ $$0P:(DE-Juel1)130525$$aBarthel, J.$$b2
000872955 7001_ $$0P:(DE-Juel1)131018$$aVoigt, J.$$b3
000872955 7001_ $$0P:(DE-HGF)0$$aSchröder, S.$$b4
000872955 7001_ $$0P:(DE-Juel1)131055$$aZakalek, P.$$b5
000872955 7001_ $$0P:(DE-Juel1)142048$$aSchmitz, Markus$$b6
000872955 7001_ $$0P:(DE-HGF)0$$aKirby, B. J.$$b7
000872955 7001_ $$0P:(DE-Juel1)142052$$aPütter, S.$$b8
000872955 7001_ $$0P:(DE-Juel1)128631$$aSchubert, J.$$b9
000872955 7001_ $$0P:(DE-Juel1)130572$$aBrückel, T.$$b10
000872955 773__ $$0PERI:(DE-600)1472968-4$$a10.1088/1361-648X/ab678c$$gVol. 32, no. 16, p. 165801 -$$n16$$p165801 -$$tJournal of physics / Condensed matter Condensed matter$$v32$$x1361-648X$$y2020
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