Studies of magnetic axis switching phenomenon in magnetite

Król, G.; Kusz, Joachim; Tarnawski, Z.; Ka̧kol, Z.; Kozłowski, A.; Honig, J. M.

doi:10.1016/j.jallcom.2006.12.152

Cited by 7 publications

(12 citation statements)

References 10 publications

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“…3), presented in Fig. 3, is in satisfactory agreement with data drawn from magnetic measurements [3].…”

Section: Discussionsupporting

confidence: 87%

“…55 K) along other cubic 0 0 1 directions, the easy axis and c monoclinic direction may switch to this direction. That this magnetic easy axis switching (AS), the effect known already since Calhoun paper in 1953 [2], is accompanied also by the switching of c monoclinic axis, was the outcome of our previous paper [3]. Here we show the preliminary measurements aimed to study how the axis switching is seen in resistivity.…”

Section: Introductionmentioning

confidence: 51%

“…along an easy axis, B[1 0 0]) and, subsequently, along the direction perpendicular to that, B[0 1 0]. In case T0 is not very low, this final measurement should result in a magnetic and c axis switching [3]. The sample was then heated to 150 K and the whole procedure was repeated starting from field cooling with B along [0 1 0] down to T0.…”

Section: Methodsmentioning

confidence: 99%

“…Since each cubic [0 0 1] axis can become the monoclinic c axis (doubled, in comparison to cubic), the sample breaks into several structural domains when freely cooled across the transition [2,3]. In contrast, the application of magnetic field along cubic [0 0 1] (easy magnetic direction both above and below T V ) on cooling prevents most of domains to form and this particular axis becomes c axis below T V .…”

Section: Introductionmentioning

confidence: 99%

“…Switching field values as drawn from magnetic measurements[3] (spheres) and the present studies (bold stars; the relevant R[1 0 0] curves after FC[1 0 0], B[0 1 0] for low magnetic fields are presented on the right inset). In the left inset, experimental R vs. B curve (bold squares) and the curve corrected for sample temperature flow (open circles) are shown.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Magnetoresistance in magnetite: Switching of the magnetic easy axis

Król

Tabiś

Przewoźnik

et al. 2009

Journal of Alloys and Compounds

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“…3), presented in Fig. 3, is in satisfactory agreement with data drawn from magnetic measurements [3].…”

Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 51%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Magnetoresistance in magnetite: Switching of the magnetic easy axis

Król

Tabiś

Przewoźnik

et al. 2009

Journal of Alloys and Compounds

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Magnetically induced structural reorientation in magnetite studied by nuclear magnetic resonance

Chlan

Kouřil

Štěpánková

et al. 2010

Journal of Applied Physics

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Phenomenon related to low symmetry phase of magnetite Fe3O4 below the Verwey transition is the switching of magnetic easy axis by external magnetic field connected with a structural transition. Results of nuclear magnetic resonance (NMR) studies of axis switching are presented, preceded by careful characterization by magnetic measurements. We detect changes in the F57e NMR spectra that evidence the structural transition interrelated with the axis switching. We also observe the switching process in time and analyze the dynamics of the phenomenon. Phenomenological approach according to Kolmogorov–Johnson–Mehl–Avrami is employed to find a link between the experimental data from magnetization measurements and NMR, showing that the effect observed by these two methods has the same origin. Additionally, NMR identifies separately the unswitched and switched phase during the switching process.

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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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Studies of magnetic axis switching phenomenon in magnetite

Cited by 7 publications

References 10 publications

Magnetoresistance in magnetite: Switching of the magnetic easy axis

Magnetoresistance in magnetite: Switching of the magnetic easy axis

Magnetically induced structural reorientation in magnetite studied by nuclear magnetic resonance

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

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