Transition of the exchange bias effect from in-plane to out-of-plane in La0.7Sr0.3MnO3:NiO nanocomposite thin films

Composite thin films arouse great interests owing to the multifunctionalities and heterointerface induced physical property tailoring. The exchange bias effect aroused from the ferromagnetic (FM)–antiferromagnetic (AFM) heterointerface is applicable in various applications such as magnetic storage. In this work, (LaFeO3)x:(La0.7Ca0.3MnO3)1−x composite thin films have been deposited via pulsed laser deposition (PLD) and the exchange bias effect was investigated. In such system, LaFeO3 (LFO) is an antiferromagnet while La0.7Ca0.3MnO3 (LCMO) is a ferromagnet, which results in the exchange bias interfacial coupling at the FM/AFM interface. The composition variation of the two phases could lead to the exchange bias field (HEB) tuning in the composite system. This work demonstrates a new composite thin film system with FM-AFM interfacial exchange coupling, which could be applied in various spintronic applications.

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Magnetic and electrical properties of LuFe2O4 epitaxial thin films with a self-assembled interface structure

CrystEngComm ◽

10.1039/c9ce01666j ◽

2020 ◽

Vol 22 (6) ◽

pp. 1096-1105 ◽

Cited By ~ 2

Author(s):

You Jin Kim ◽

Shinya Konishi ◽

Yuichiro Hayasaka ◽

Itsuhiro Kakeya ◽

Katsuhisa Tanaka

Keyword(s):

Thin Film ◽

Thin Films ◽

Glass Transition ◽

Exchange Bias ◽

Interface Structure ◽

Yttria Stabilized Zirconia ◽

Epitaxial Thin Films ◽

Stabilized Zirconia ◽

Bias Effect ◽

Exchange Bias Effect

Thin film of LuFe2O4, one of multiferroics, deposited on an yttria-stabilized zirconia substrate shows a unique interface structure, leading to an exchange bias effect. The thin film itself undergoes spin glass or cluster glass transition.

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Overcoming the limits of exchange bias effect in the magnetic thin films by introducing nanostructured internal interfaces

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2019.165814 ◽

2020 ◽

Vol 494 ◽

pp. 165814

Author(s):

Min-Seung Jung ◽

Tae-Hwan Kim ◽

Mi-Young Im ◽

Jung-Il Hong

Keyword(s):

Thin Films ◽

Exchange Bias ◽

Magnetic Thin Films ◽

Bias Effect ◽

Exchange Bias Effect

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Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

Scientific Reports ◽

10.1038/s41598-021-92640-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

I. Hontecillas ◽

M. Maicas ◽

J. P. Andrés ◽

R. Ranchal

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Magnetic Anisotropy ◽

Coupling Effect ◽

Perpendicular Magnetic Anisotropy ◽

Interfacial Coupling ◽

Bias Effect ◽

Exchange Bias Effect ◽

Sample Plane ◽

Out Of Plane

AbstractHere it is investigated the effect of the antiferromagnet Cr2O3 on the magnetic properties of ferromagnetic Fe72Ga28 thin films. Sputtered Fe72Ga28 layers have their magnetization in the sample plane with a magnetic fluctuation that gives rise to magnetic ripple. In order to turn its magnetization into the out of plane (OOP) direction, it has been magnetically coupled with Cr2O3 that has magnetic moments along the c-axis, that is the perpendicular direction when properly aligned. Cr2O3 has been obtained from Cr oxidation, whereas Fe72Ga28 has been deposited on top of it by sputtering in the ballistic regime. Although a uniaxial in-plane magnetic anisotropy is expected for Fe72Ga28 thickness above 100 nm, the interfacial coupling with Cr2O3 prevents this anisotropy. The formation of stripe domains in Fe72Ga28 above a critical thickness reveals the enhancement of the out of plane component of the Fe72Ga28 magnetization with respect to uncoupled layers. Due to the interface coupling, the Fe72Ga28 magnetization turns into the out-of-plane direction as its thickness is gradually reduced, and a perpendicular magnetic anisotropy of 3·106 erg·cm−3 is inferred from experimental results. Eventually, the coupling between Cr2O3 and Fe72Ga28 promotes an exchange-bias effect that has been well fitted by means of the random field model.

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