Magnetic Anisotropy and Rotational Hysteresis in Single Crystals of Magnetite below the Transition Temperature

Pearson, R. F.; Cooper, R. W.

doi:10.1088/0370-1328/78/1/304

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…It is clearly found that the shifted loop disappears above TB110 K, that is, Verwey transition temperature. Rotational hysteresis, which is related to the shifted loop mechanism, has been reported for natural single crystals of Fe 3 O 4 samples below Verwey transition temperature [32,33]. But, as reported by Venzke et al [11], the shifted loop was found for NiFe 2 O 4 films grown at 600 C, and was eliminated completely after the film was annealed at 1000 C. They pointed out that the shifted loop was induced by the antiferromagnetic exchange coupling or glassy magnetic properties due to interface effect.…”

Section: Resultsmentioning

confidence: 89%

Magnetic anisotropic properties in Fe3O4 and CoFe2O4 ferrite epitaxy thin films

Horng

Chern

Chen

et al. 2004

Journal of Magnetism and Magnetic Materials

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Section: Resultsmentioning

confidence: 89%

Magnetic anisotropic properties in Fe3O4 and CoFe2O4 ferrite epitaxy thin films

Horng

Chern

Chen

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…While exchange bias is typically observed in systems featuring two magnetic phases, magnetite, being a ferri magnet with intricate crystal structure and structural defects, [ 42,43 ] is known for exhibiting exchange bias on its own in thin films deposited on various non‐magnetic substrates. [ 44,45 ] Furthermore, rotational hysteresis, related to EB, has been reported for substituted Fe 3 O 4 single crystals [ 46 ] below the Verwey transition temperature, where the magnetic easy axes change direction. [ 39 ] The exchange bias in magnetite films, free of foreign magnetic phases, undoubtedly has a very complex origin and is not fully understood at present.…”

Section: Resultsmentioning

confidence: 99%

Strain‐driven Switching Between Antiferromagnetic States in Frustrated Antiferromagnet UO₂ Probed by Exchange Bias Effect

Tereshina‐Chitrova,

Pourovskii,

Khmelevskyi

et al. 2023

Adv Funct Materials

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Frustrated antiferromagnets offer a captivating platform to study the intricate relationship of magnetic interactions, geometric constraints, and emergent phenomena. By controlling spin orientations, these materials can be tailored for applications in spintronics and quantum information processing. The research focuses on the interplay of magnetic and exchange anisotropy effects in artificial heterostructures based on a canonical frustrated antiferromagnet, UO2. The potential to manipulate the spin directions in this material and switch between distinct antiferromagnetic (AFM) states is investigated using substrate‐induced strain. The phenomenon is probed using exchange bias effects in stoichiometric UO2/Fe3O4 bilayers. By employing many‐body first‐principles calculations magnetic configurations in the UO2 layers are identified. Even a minor tetragonal distortion triggers a transition between AFM states of different symmetries, driven by a robust alteration of single‐ion anisotropy due to the distortion. Consequently, this change influences the arrangement of magnetic moments at the UO2/Fe3O4 interface, affecting the magnitude of exchange bias. The findings showcase how epitaxial strain can effectively manipulate the AFM states in frustrated antiferromagnets by controlling single‐site anisotropy.

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“…However, a preferred orientation of the monoclinic axes is only generated when magnetite is cooled through T V in a field (Williams & Bozorth 1953; Palmer 1963). When it is cooled in zero‐field, the axes are randomly distributed and the torque curve is dominated by a 4θ‐signal (Pearson & Cooper 1961; Höhne et al 2000). Therefore, we do not expect a 2θ‐component due to ferromagnetic magnetocrystalline anisotropy in zero‐field cooled rock samples.…”

Section: Discussionmentioning

confidence: 99%

Separation of diamagnetic and paramagnetic anisotropy by high-field, low-temperature torque measurements

Schmidt¹,

Hirt²,

Rosselli³

et al. 2007

Geophysical Journal International

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S U M M A R YThe anisotropy of magnetic susceptibility (AMS) of rocks can be composed of contributions from ferromagnetic, paramagnetic and diamagnetic minerals. However, in general the AMS of only one fraction is of interest. While there are several approaches to isolate the ferromagnetic contribution to the AMS, the separation of the diamagnetic from the paramagnetic contribution is still problematic. A new method for the separation of these two contributions based on high-field torque measurements at room and low-temperature is presented. The paramagnetic anisotropy increases at low temperature according to the Curie-Weiss law, whereas the diamagnetic contribution is temperature independent. If the paramagnetic AMS is due to perfectly oblate or prolate minerals and the ratio of the susceptibility differences at two temperatures is known, paramagnetic and diamagnetic AMS can be separated. When measuring in fields high enough to saturate the ferromagnetic phases all three contributions to the AMS can be separated. The separation of paramagnetic and diamagnetic AMS is demonstrated on natural crystals and synthetic calcite-muscovite aggregates. A high-field torque magnetometer, equipped with a cryostat for measurements at 77 K, allows sensitive measurements at two different temperatures. The sensitivity at 77 K is 3 × 10 −7 J and standard-sized (palaeomagnetic) samples of 11.4 cm 3 can be measured. This new method is especially suited for the investigation of diamagnetic fabrics of impure carbonate rocks.

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Magnetic Anisotropy and Rotational Hysteresis in Single Crystals of Magnetite below the Transition Temperature

Cited by 12 publications

References 6 publications

Magnetic anisotropic properties in Fe3O4 and CoFe2O4 ferrite epitaxy thin films

Magnetic anisotropic properties in Fe3O4 and CoFe2O4 ferrite epitaxy thin films

Strain‐driven Switching Between Antiferromagnetic States in Frustrated Antiferromagnet UO₂ Probed by Exchange Bias Effect

Separation of diamagnetic and paramagnetic anisotropy by high-field, low-temperature torque measurements

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Magnetic Anisotropy and Rotational Hysteresis in Single Crystals of Magnetite below the Transition Temperature

Cited by 12 publications

References 6 publications

Magnetic anisotropic properties in Fe3O4 and CoFe2O4 ferrite epitaxy thin films

Magnetic anisotropic properties in Fe3O4 and CoFe2O4 ferrite epitaxy thin films

Strain‐driven Switching Between Antiferromagnetic States in Frustrated Antiferromagnet UO2 Probed by Exchange Bias Effect

Separation of diamagnetic and paramagnetic anisotropy by high-field, low-temperature torque measurements

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Product

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Strain‐driven Switching Between Antiferromagnetic States in Frustrated Antiferromagnet UO₂ Probed by Exchange Bias Effect