Magnetic domain structure of La0.7Sr0.3MnO3 thin-films probed at variable temperature with scanning electron microscopy with polarization analysis

Reeve, Robert M.; Mix, Christian; König, Markus; Foerster, Michael; Jakob, G.; Kläui, Mathias

doi:10.1063/1.4798538

Cited by 22 publications

(17 citation statements)

References 31 publications

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“…We find SFM ordering with multiple domains several hundreds of nanometers across. While the domain state is reminiscent of that observed for a continuous ferromagnetic thin film, 19 the characteristic domain size is significantly smaller. This is because the dipolar coupling, which favors parallel alignment of the nanomagnets in the array, is much weaker than the exchange interaction responsible for the spin alignment in a continuous ferromagnet.…”

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confidence: 82%

Tailoring the magnetic order in a supermagnetic metamaterial

et al. 2017

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The emergent magnetism in close-packed assemblies of interacting superparamagnetic particles is commonly referred to as supermagnetism. The magnetic characteristics of such systems are determined by the dipolar coupling between the nanomagnets, rather than the exchange interaction responsible for ferro- and antiferromagnetism in continuous material. The dipolar coupling facilitates tuning of the magnetism, which renders supermagnetic ensembles suitable model systems for exploration of new physics. In this work, we discuss micromagnetic simulations of regular arrays of thin film nanomagnets, with magnetic material parameters typical of the ferromagnetic oxide La0.7Sr0.3MnO3. The ground state supermagnetic order in these systems is primarily determined by the lattice configuration, in that a square lattice results in antiferromagnetic order, whereas a triangular lattice shows ferromagnetic order. We found that a square lattice of circular nanomagnets may be switched from superferromagnetic to superantiferromagnetic order by a small external field applied in the appropriate direction.

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confidence: 82%

Tailoring the magnetic order in a supermagnetic metamaterial

et al. 2017

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“…Such substrate material was previously successfully utilized, for instance, by Herklotz et al [10] for the generation of strain in manganite thin films. While manganites are interesting for their complex magnetic and electric properties, the relatively low Curie temperature (in particular, of the surface magnetization [11]) makes the use of this compound in applications challenging. More suitable materials for applications are 3d metals, which exhibit reliable magnetic properties at room temperature.…”

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confidence: 99%

Magnetic Anisotropy Engineering in Thin Film Ni Nanostructures by Magnetoelastic Coupling

et al. 2014

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A phenomenon that can be exploited for the manipulation of magnetization without the conventional current-generated magnetic fields is magnetoelastic coupling, which might, thus, pave the way for lowpower data-storage devices. Here, we report a quantitative analysis of the magnetic uniaxial anisotropy induced by piezoelectric strain in Ni nanostructured squares. By applying strain, the magnetic domains in Ni nanostructured squares can be manipulated by the magnetoelastic effect in the Ni. The strain-induced anisotropy displaces the domain walls in the square leading to changes in the domain sizes. By comparing the experiments with micromagnetic simulations, the resulting uniaxial anisotropy is quantified. We find a good agreement for a magnetostrictive constant of λ s ¼ −26 ppm, confirming a full strain transfer from the piezoelectric to the Ni nanostructures and the retainment of a bulklike λ s .

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“…This could be due to the low top layer thickness reducing the Curie temperature or the lower Curie temperature of the surface magnetization. 16 Fig. 4(a) shows an XMCD-PEEM image of the top LSMO layer at 200 K illustrating a typical stripe-like domain pattern.…”

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Direct observation of temperature dependent magnetic domain structure of the multiferroic La0.66Sr0.34MnO3/BiFeO3 bilayer system by x-ray linear dichroism- and x-ray magnetic circular dichroism-photoemission electron microscopy

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Buzzi

et al. 2014

Journal of Applied Physics

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Low-thickness La0.66Sr0.34MnO3 (LSMO)/BiFeO3 (BFO) thin film samples deposited on SrTiO3 were imaged by high resolution x-ray microscopy at different temperatures. The ultra-thin thickness of the top layer allows to image both the ferromagnetic domain structure of LSMO and the multiferroic domain structure of the buried BFO layer, opening a path to a direct observation of coupling at the interface on a microscopic level. By comparing the domain size and structure of the BFO and LSMO, we observed that, in contrast to LSMO single layers, LSMO/BFO multilayers show a strong temperature dependence of the ferromagnetic domain structure of the LSMO. Particularly, at 40 K, a similar domain size for BFO and LSMO is observed. This indicates a persistence of exchange coupling on the microscopic scale at a temperature, where the exchange bias as determined by magnetometer measurements is vanishing.

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Magnetic domain structure of La0.7Sr0.3MnO3 thin-films probed at variable temperature with scanning electron microscopy with polarization analysis

Cited by 22 publications

References 31 publications

Tailoring the magnetic order in a supermagnetic metamaterial

Tailoring the magnetic order in a supermagnetic metamaterial

Magnetic Anisotropy Engineering in Thin Film Ni Nanostructures by Magnetoelastic Coupling

Direct observation of temperature dependent magnetic domain structure of the multiferroic La0.66Sr0.34MnO3/BiFeO3 bilayer system by x-ray linear dichroism- and x-ray magnetic circular dichroism-photoemission electron microscopy

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