Easy axis switching in magnetite

Ka̧kol, Z.; Król, G.; Tabiś, Wojciech; Kołodziej, Tomasz; Wiśniewski, A.; Štěpánková, H.; Chlan, V.; Kusz, Joachim; Tarnawski, Z.; Kozłowski, A.; Honig, J.M.

doi:10.1088/1742-6596/303/1/012106

Cited by 10 publications

(16 citation statements)

References 48 publications

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“…• Studies of the easy-axis switching in magnetite [10,[38][39][40] revealed thermally activated behavior with an activation energy in the range 25-33 meV.…”

Section: Discussionmentioning

confidence: 99%

Magnetite (Fe₃O₄): a new variant of relaxor multiferroic?

Ziese

Esquinazi

Pantel

et al. 2012

J. Phys.: Condens. Matter

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The electric polarization, dielectric permittivity, magnetoelectric effect, heat capacity, magnetization and ac susceptibility of magnetite films and polycrystals were investigated. The electric polarization of magnetite films with saturation values between 4 and 8 μC cm(-2) was found to vanish between 32 and 38 K, but in polycrystals no phase transition was detected in this range by heat capacity. Both types of samples showed magnetoelectric effects at low temperatures below a frequency-dependent crossover. This is interpreted as arising from multiferroic relaxor behavior.

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“…• Studies of the easy-axis switching in magnetite [10,[38][39][40] revealed thermally activated behavior with an activation energy in the range 25-33 meV.…”

Section: Discussionmentioning

confidence: 99%

Magnetite (Fe₃O₄): a new variant of relaxor multiferroic?

Ziese

Esquinazi

Pantel

et al. 2012

J. Phys.: Condens. Matter

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“…After the second MNP was moved from C3 to C2, the coercive field was reduced to about 52 mT. The origin of this change is believed to be magnetite’s cubic-to-monoclinic transition at the Verwey temperature T V ≈ 120 K, where the reordering of the lattice alters the crystalline anisotropy. , The Verwey transition is reflected by the jump in the B c ( T ) dependence of collective MNPs; see Figure . The lower transition temperature may be caused by a partial oxidation of the magnetite .…”

Section: Resultsmentioning

confidence: 99%

“…When no field is applied, the orientation of the monoclinic c -axis, associated with the easy axis, will be arbitrary. When subject to a sufficient field during the transition, the easy axis can be aligned with the cubic edge closest to the field direction Figure shows Hall effect measurements of the Hall cross bar C2 that was field-cooled (FC) in B = 1 T at three different angles, ϕ, between the field direction and substrate surface normal.…”

Section: Resultsmentioning

confidence: 99%

“…When subject to a sufficient field during the transition, the easy axis can be aligned with the cubic edge closest to the field direction. 47 Figure 6 shows Hall effect measurements of the Hall cross bar C2 that was field-cooled (FC) in B = 1 T at three different angles, ϕ, between the field direction and substrate surface normal. The field was applied during the cooling of the sample from T = 170 K to base temperature T = 5 K. The Hall effect was measured, as before, with ϕ = 0° (field perpendicular to sample plane).…”

Section: Resultsmentioning

confidence: 99%

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Atomic Force Manipulation of Single Magnetic Nanoparticles for Spin-Based Electronics

et al. 2022

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Magnetic nanoparticles (MNPs) are instrumental for fabrication of tailored nanomagnetic structures, especially where top-down lithographic patterning is not feasible. Here, we demonstrate precise and controllable manipulation of individual magnetite MNPs using the tip of an atomic force microscope. We verify our approach by placing a single MNP with a diameter of 50 nm on top of a 100 nm Hall bar fabricated in a quasi-two-dimensional electron gas (q2DEG) at the oxide interface between LaAlO3 and SrTiO3 (LAO/STO). A hysteresis loop due to the magnetic hysteresis properties of the magnetite MNPs was observed in the Hall resistance. Further, the effective coercivity of the Hall resistance hysteresis loop could be changed upon field cooling at different angles of the cooling field with respect to the measuring field. The effect is associated with the alignment of the MNP magnetic moment along the easy axis closest to the external field direction across the Verwey transition in magnetite. Our results can facilitate experimental realization of magnetic proximity devices using single MNPs and two-dimensional materials for spin-based nanoelectronics.

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“…3(a). 2 First, the sample was FC down to 8 K in the magnetic field of 2 T, high enough to uniquely define the basic c M axis along the [010] direction [51] [left panel in Fig. 3(a)].…”

Section: A Resonant X-ray Scatteringmentioning

confidence: 99%

Magnetic field induced structural changes in magnetite observed by resonant x-ray diffraction and Mössbauer spectroscopy

Kołodziej¹,

Bialo

Tabiś

et al. 2020

Phys. Rev. B

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When a magnetic field is applied to a single crystal of magnetite at 124 K > T > 50 K, the monoclinic c M axis, which is the easy magnetization axis, switches to one of the 100 cubic directions, nearest to the direction of the magnetic field, and the phenomenon known as an axis switching (AS) occurs. A global symmetry probe, resonant x-ray scattering, and a local probe, Mössbauer spectroscopy, are used to better understand the mechanism of axis switching. The behavior of three subsystems ordered below the Verwey transition temperature T V , i.e., lattice distortion, an orbital, and charge orderings, was observed via resonant x-ray scattering as a function of an external magnetic field. This was preceded by calculation of selected peak intensities using the FDMNES code. The Mössbauer spectroscopy studies confirmed that the magnetic field triggers electronic rearrangements and atomic displacements. The structure observed after the process of axis switching is very similar to the one obtained after cooling below T V with the magnetic field applied along one of the initial 100 cubic directions and distinct from the cooling in the absence of a magnetic field. From all the experimental observations of the phenomenon done so far, it is clear that AS starts from the fluctuations between octahedral iron orbitals that ultimately lead to the Verwey transition, but also to the higher-temperature trimeron dynamics. Therefore, further observation of the axis switching may be a key point to the understanding of a majority of strongly correlated electronic behavior in magnetite as well as in other transition metal oxides.

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Easy axis switching in magnetite

Cited by 10 publications

References 48 publications

Magnetite (Fe₃O₄): a new variant of relaxor multiferroic?

Magnetite (Fe₃O₄): a new variant of relaxor multiferroic?

Atomic Force Manipulation of Single Magnetic Nanoparticles for Spin-Based Electronics

Magnetic field induced structural changes in magnetite observed by resonant x-ray diffraction and Mössbauer spectroscopy

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Easy axis switching in magnetite

Cited by 10 publications

References 48 publications

Magnetite (Fe3O4): a new variant of relaxor multiferroic?

Magnetite (Fe3O4): a new variant of relaxor multiferroic?

Atomic Force Manipulation of Single Magnetic Nanoparticles for Spin-Based Electronics

Magnetic field induced structural changes in magnetite observed by resonant x-ray diffraction and Mössbauer spectroscopy

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Product

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Magnetite (Fe₃O₄): a new variant of relaxor multiferroic?

Magnetite (Fe₃O₄): a new variant of relaxor multiferroic?