Anomalous magnetic properties of Fe3O4 nanostructures on GaAs substrate probed using X-ray magnetic circular dichroism

Phase, D. M.; Panchal, Gyanendra; Rawat, Ritu; Tiwari, Shivani; Prakash, Ram; Jain, Deepti; Choudhary, R. J.

doi:10.1016/j.jmmm.2019.03.041

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…31 The thin film is partially relaxed in-plane because of a high degree of lattice mismatch between Fe 3 O 4 (cubic structure with a = 8.396 Å) and BTO (4.47 % with c-domain and 6.97 % with a-domain) lattice parameters. 32 These results from X-ray diffraction measurements clearly confirm that the Fe 3 O 4 thin film adopts the underlying domain pattern of the BTO substrate.…”

Section: A Structural Propertiessupporting

confidence: 55%

Strain and electric field control of magnetic and electrical transport properties in a magneto-elastically coupled Fe3O4/BaTiO3(001) heterostructure

Panchal,

Kojda,

Sahoo

et al. 2022

Preprint

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We present a study of the control of electric field induced strain on the magnetic and electrical transport properties in a magneto-elastically coupled artificial multiferroic Fe3O4/BaTiO3 heterostructure. In this Fe3O4/BaTiO3 heterostructure, the Fe3O4 thin film is epitaxially grown in the form of bilateral domains, analogous to a-c stripe domains of the underlying BaTiO3(001) substrate. By in-situ electric field dependent magnetization measurements, we demonstrate the extrinsic control of the magnetic anisotropy and the characteristic Verwey metal-insulator transition of the epitaxial Fe3O4 thin film in a wide temperature range between 20-300 K, via strain mediated converse magnetoelectric coupling. In addition, we observe strain induced modulations in the magnetic and electrical transport properties of the Fe3O4 thin film across the thermally driven intrinsic ferroelectric and structural phase transitions of the BaTiO3 substrate. In-situ electric field dependent Raman measurements reveal that the electric field does not significantly modify the anti-phase boundary defects in the Fe3O4 thin film once it is thermodynamically stable after deposition and that the modification of the magnetic properties is mainly caused by strain induced lattice distortions and magnetic anisotropy. These results provide a framework to realize electrical control of the magnetization in a classical highly correlated transition metal oxide.

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Section: A Structural Propertiessupporting

confidence: 55%

Strain and electric field control of magnetic and electrical transport properties in a magneto-elastically coupled Fe3O4/BaTiO3(001) heterostructure

Panchal,

Kojda,

Sahoo

et al. 2022

Preprint

Self Cite

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“…The energy of the M 2,3 edges matched perfectly with the previous reports for Ru 4+ establishing stoichiometry of both the films. The same beamline was employed to measure the x-ray magnetic circular dichroism (XMCD) spectra at the Ru M 2,3 edges in total electron yield (TEY) mode [29] at 110 K using a liquid nitrogen cell. Temperature dependent Raman spectroscopy measurements were performed using LABRAM HR-800 micro-Raman set-up equipped with 632.8 nm excitation laser source, an 1800 gr mm −1 grating and a Peltier cooled CCD detector.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Strain healing of spin–orbit coupling:a cause for enhanced magnetic moment in epitaxial SrRuO₃ thin films

Tyagi

Sathe

Sharma

et al. 2020

J. Phys.: Condens. Matter

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Enhanced magnetic moment and coercivity in SrRuO3 thin films are significant issues for advanced technological usages and hence are researched extensively in recent times. Most of the previous reports on thin films with enhanced magnetic moment attributed the high spin state for the enhancement. Our magnetization results show high magnetic moment of 3.3 B/Ru ion in the epitaxial thin films grown on LSAT substrate against 1.2 B/Ru ion observed in bulk compound. Contrary to the expectation the Ru ions are found to be in low spin state and the orbital moment is shown to be contributing significantly in the enhancement of magnetic moment. We employed x-ray absorption spectroscopy and resonant valance band spectroscopy to probe the spin state and orbital contributions in these films. The existence of strong spin-orbit coupling responsible for the de-quenching of the 4d orbitals is confirmed by the observation of the non-statistical large branching ratio at the Ru M2,3 absorption edges. The relaxation of orbital quenching by strain engineering provides a new tool for enhancing magnetic moment. Strain disorder is shown to be an efficient mean to control the spin-orbit coupling.

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“…This is somewhat unexpected since in pure Fe 3 O 4 nanoparticles the surface tends to have a lower magnetic moment than the bulk due to surface disorder . Nevertheless, it is important to emphasize that magnetic moments considerably larger than bulk values have been often reported in Fe 3 O 4 (and other ferrites) thin films. − These enhanced moments are typically reported to occur for very thin films or at surfaces and are usually linked to specific defects such as grain boundaries, vacancies, or antiphase boundaries. − Thus, common defects often observed in this type of (and similar) nanoparticles, such as cation inversion, lattice distortions, Fe 2+ vacancies, or grain boundaries could also contribute to the enhanced moment. ,,, The second possible uncommon effect that can be inferred for the magnetic moment is the unusually low moment in the outer Fe 1+ x O core. Namely, due to vacancy clustering Fe 1+ x O is expected to have larger moment than FeO.…”

Section: Resultsmentioning

confidence: 99%

Direct Evidence of a Graded Magnetic Interface in Bimagnetic Core/Shell Nanoparticles Using Electron Magnetic Circular Dichroism (EMCD)

et al. 2021

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Interfaces play a crucial role in composite magnetic materials and particularly in bimagnetic core/shell nanoparticles. However, resolving the microscopic magnetic structure of these nanoparticles is rather complex. Here, we investigate the local magnetization of antiferromagnetic/ferrimagnetic FeO/Fe3O4 core/shell nanocubes by electron magnetic circular dichroism (EMCD). The electron energy-loss spectroscopy (EELS) compositional analysis of the samples shows the presence of an oxidation gradient at the interface between the FeO core and the Fe3O4 shell. The EMCD measurements show that the nanoparticles are composed of four different zones with distinct magnetic moment in a concentric, onion-type, structure. These magnetic areas correlate spatially with the oxidation and composition gradient with the magnetic moment being largest at the surface and decreasing toward the core. The results show that the combination of EELS compositional mapping and EMCD can provide very valuable information on the inner magnetic structure and its correlation to the microstructure of magnetic nanoparticles.

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Anomalous magnetic properties of Fe3O4 nanostructures on GaAs substrate probed using X-ray magnetic circular dichroism

Cited by 11 publications

References 35 publications

Strain and electric field control of magnetic and electrical transport properties in a magneto-elastically coupled Fe3O4/BaTiO3(001) heterostructure

Strain and electric field control of magnetic and electrical transport properties in a magneto-elastically coupled Fe3O4/BaTiO3(001) heterostructure

Strain healing of spin–orbit coupling:a cause for enhanced magnetic moment in epitaxial SrRuO₃ thin films

Direct Evidence of a Graded Magnetic Interface in Bimagnetic Core/Shell Nanoparticles Using Electron Magnetic Circular Dichroism (EMCD)

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Anomalous magnetic properties of Fe3O4 nanostructures on GaAs substrate probed using X-ray magnetic circular dichroism

Cited by 11 publications

References 35 publications

Strain and electric field control of magnetic and electrical transport properties in a magneto-elastically coupled Fe3O4/BaTiO3(001) heterostructure

Strain and electric field control of magnetic and electrical transport properties in a magneto-elastically coupled Fe3O4/BaTiO3(001) heterostructure

Strain healing of spin–orbit coupling:a cause for enhanced magnetic moment in epitaxial SrRuO3 thin films

Direct Evidence of a Graded Magnetic Interface in Bimagnetic Core/Shell Nanoparticles Using Electron Magnetic Circular Dichroism (EMCD)

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Strain healing of spin–orbit coupling:a cause for enhanced magnetic moment in epitaxial SrRuO₃ thin films