Magnetic properties of ferromagnetic-antiferromagnetic bi-layers with different spin configuration
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The structural and magnetic properties of a series of superlattices consisting of two ferromagnetic metals La0.7Sr0.3MnO3 (LSMO) and SrRuO3 (SRO) grown on (001) oriented SrTiO3 are studied. Superlattices with a fixed LSMO layer thickness of 20unit cells and varying SRO layer thickness show a sudden drop in magnetization on cooling through a temperature where both LSMO and SRO layers are ferromagnetic. This behavior suggests an antiferromagnetic coupling between the layers. In addition, the samples having thinner SRO layers (n<6) exhibit enhanced saturation magnetization at 10K. These observations are attributed to the possible modification in the stereochemistry of the Ru and Mn ions in the interfacial region.
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In this study, we report on a temperature-driven antiferromagnetic (AF) spin reorientation transition in micro- and nanostructures of AF/ferromagnetic (FM) LaFeO3/La0.7Sr0.3MnO3 thin film bilayers. Using a combination of x-ray photoemission electron microscopy and x-ray absorption spectroscopy, the Néel vector is shown to reorient 90° as a result of the competition between a shape-imposed anisotropy in the AF layer and interface coupling to the adjacent FM layer. We demonstrate how a temperature dependence of the AF/FM spin configuration in line-shaped nanomagnets can be tuned by variation of their linewidth. This work provides insight into the AF/FM interface exchange coupling in complex oxide heterostructures and the possibilities of spin control by nanostructuring in thin film spintronics.
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Effects of electric fields on magnetization of ferromagnetic Ni films grown on a Cu(001) single crystal covered with antiferromagnetic NiO overlayer are investigated by means of X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD), and magneto-optical Kerr effect (MOKE). The growth of the NiO overlayer on the Ni film is confirmed by XAS, and it is revealed by XMCD and MOKE that the NiO/Ni films show a spin reorientation transition from in-plane to perpendicular magnetization with increasing Ni thickness. It is also observed that the coercive field of the Ni films increases as the NiO thickness increases, possibly due to the interaction with antiferromagnetic NiO. Remanent magnetization of the Ni film is found to be modified by the application of electric fields. The possible origin of the electric-field effects is discussed, and some change in magnetic anisotropy of the Ni film is suggested. [DOI: 10.1380/ejssnt.2018.186]
Magnetism
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Interface (matter)
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Antiferromagnetically coupled multilayers with perpendicular anisotropy, such as [CoPt]∕Ru, Co∕Ir, and Fe∕Au, display ferromagnetic stripe phases as the ground states. It is theoretically shown that the antiferromagnetic interlayer exchange causes a relative shift of domains in adjacent layers. This “exchange shift” is responsible for several recently observed effects: an anomalous broadening of domain walls, the formation of the so-called “tiger-tail” patterns, and a “mixed state” of antiferromagnetic and ferromagnetic domains in [CoPt]∕Ru multilayers. The derived analytical relations between the values of the shift and the strength of antiferromagnetic coupling provide an effective method for a quantitative determination of the interlayer exchange interactions.
Exchange interaction
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1) Introduction 2) Growth of antiferromagnetic oxide thin films 3) Dichroism in x-ray absorption for the study of antiferromagnetic materials 4) Antiferromagnetic oxide films on non-magnetic substrates 5) Exchange bias by antiferromagnetic oxides 6) Theory of ferromagnetic-antiferromagnetic interface coupling 7) Antiferromagnetic-ferromagnetic oxide multilayers: Fe3O4-based systems as a model 8) Micromagnetic structure: Imaging antiferromagnetic domains using soft x-ray microscopy
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Exchange bias
Superparamagnetism
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Magnetic phases of NiO and MnO ultrathin films are established on the basis of a Hamiltonian including superexchange and dipolar interaction, disregarding the magnetocrystalline interaction because of its considerably smaller contribution in these films. The employed theoretical approach demonstrates that the finite thickness is substantially more important than the strain effect on the stabilization of the ground state configurations. An antiferromagnetic phase where ferromagnetic layers are piled up with alternating opposite in-plane orientations of the spins appears in NiO and MnO (111) ultrathin films, while a striped antiferromagnetic phase with the larger component of the magnetic moments along the growth direction is found in NiO and MnO (001) ultrathin films. These results are in qualitative agreement with available experimental results, but they disagree with the ones of a former theory, which is carefully examined.
Superexchange
Non-blocking I/O
Hamiltonian (control theory)
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We observe highly efficient dynamic spin injection from ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ (YIG) into NiO, an antiferromagnetic (AF) insulator, via strong coupling, and robust spin propagation in NiO up to 100-nm thickness mediated by its AF spin correlations. Strikingly, the insertion of a thin NiO layer between YIG and Pt significantly enhances the spin currents driven into Pt, suggesting exceptionally high spin transfer efficiency at both $\mathrm{YIG}/\mathrm{NiO}$ and $\mathrm{NiO}/\mathrm{Pt}$ interfaces. This offers a powerful platform for studying AF spin pumping and AF dynamics as well as for exploration of spin manipulation in tailored structures comprising metallic and insulating ferromagnets, antiferromagnets, and nonmagnetic materials.
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Magnetic and magnetotransport properties of Mn2−xCuxSb (x=0, 0.1, 0.2, and 0.4) compounds have been studied. A phase transition from a ferrimagnetic to an antiferromagnetic state occurs in the Cu-substituted compounds as the temperature is reduced. A magnetic field-driven transition takes place in the Cu-containing compounds, changing the spin configuration from antiferromagnetic to ferromagnetic. The giant magnetoresistance effect is observed in these compounds, accompanying the transition. The largest magnetoresistance ratio of −40% is observed for Mn1.9Cu0.1Sb at 170 K in a magnetic field of 5 T.
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Colossal Magnetoresistance
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