Magnetic and Orbital Ordering in the Spinel<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MnV</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

Garlea, V. Ovidiu; Jin, Rongying; Mandrus, David; Roessli, B.; Huang, Q.; Miller, Marcelo; Schultz, Arthur J.; Nagler, S. E.

doi:10.1103/physrevlett.100.066404

Cited by 161 publications

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“…The sublattice B total angular momentum is j B = l B + s B = 5/2, and g-factor g B = 2 which is larger then atomic value, because of the anisotropy. The magnetization of the system g A M A + g B M B as a function of the temperature is depicted in Fig.1 The figure is in a very good agrement with the experimental ZFC magnetization curves [2,3]. (see Fig.1 [9]).…”

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confidence: 49%

“…(see Fig.1 [9]). The anomalous temperature dependence of the magnetization, predicted by Neel, is reproduced, but there is an important difference between Neel's theory, interpretation of NMR results [2,3], and the present modified spin-wave theory. Neel's calculations predict a temperature T N at which both the sublattice A and B magnetization become equal to zero.…”

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confidence: 57%

“…A modified spin-wave theory is developed to describe the two phases and to calculate the magnetization as a function of temperature. The anomalous M (T ) curve reproduces the experimentally obtained ZFC magnetization [2,3].Because of the strong spin-orbital interaction it is convenient to consider jj coupling with J A = S A and J B = L B + S B . The sublattice A total angular momentum is j A = s A = 5/2, while the sublattice B total angular momentum is j B = l B + s B , and sublattice A magnetic order is antiparallel with sublattice B one.…”

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confidence: 77%

“…This Letter is inspired from the experimental measurements of the ZFC magnetization of M nV 2 O 4 [1,2,3]. The profile of the experimental curve reproduces the anomalous magnetization curve predicted by L. Neel [4,5] for ferrimagnets with equal sublattice spins.…”

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confidence: 94%

“…The additional phase transition demonstrates itself through the anomalous temperature variation of the spontaneous magnetization, but it is important to discuss alternative experimental detections of T * transition. This is why we consider the FC magnetization curves [2,3]. For samples cooled in a field (FC magnetization) the field leads to formation of a single domain and, in addition, increases the chaotic order of the spontaneous magnetization of the vanadium electrons, which is antiparallel with it.…”

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confidence: 99%

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Ferrimagnetism of MnV₂O₄spinel

Karchev

2009

J. Phys.: Condens. Matter

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The spinel M nV2O4 is a two-sublattice ferrimagnet, with site A occupied by the M n 2+ ion and site B by the V 3+ ion. The magnon of the system, the transversal fluctuation of the total magnetization, is a complicated mixture of the sublattice A and B transversal magnetic fluctuations. As a result, the magnons' fluctuations suppress in a different way the manganese and vanadium magnetic orders and one obtains two phases. At low temperature (0, T * ) the magnetic orders of the M n and V ions contribute to the magnetization of the system, while at the high temperature (T * , TN ), the vanadium magnetic order is suppressed by magnon fluctuations, and only the manganese ions have non-zero spontaneous magnetization. A modified spin-wave theory is developed to describe the two phases and to calculate the magnetization as a function of temperature. The anomalous M (T ) curve reproduces the experimentally obtained ZFC magnetization.PACS numbers: 75.50. Gg, 75.30.Ds, 75.60.Ej, This Letter is inspired from the experimental measurements of the ZFC magnetization of M nV 2 O 4 [1, 2, 3]. The profile of the experimental curve reproduces the anomalous magnetization curve predicted by L. Neel [4,5] for ferrimagnets with equal sublattice spins. This stimulates to model the manganese vanadate spinel in the spirit of the Neel's theory. By comparing and contrasting ZFC and FC magnetization one gains insight into a magnetism of the manganese vanadate oxide.The spinel M nV 2 O 4 is a two-sublattice ferrimagnet, with site A occupied by the M n 2+ ion, which is in the 3d 5 high-spin configuration with quenched orbital angular momentum, which can be regarded as a simple s = 5/2 spin. The B site is occupied by the V 3+ ion, which takes the 3d 2 high-spin configuration in the triply degenerate t 2g orbital, and has orbital degrees of freedom. The measurements show that the set in of the magnetic order is at Neel temperature T N = 56K [1], and that the magnetization has a maximum near T * = 50K. Below this temperature the magnetization sharply decreases and goes to zero when temperature approaches zero.We consider a system which obtains its magnetic properties from M n and V magnetic moments. It is shown that the true magnons in this system, which are the transversal fluctuations corresponding to the total magnetization, are complicated mixtures of the M n and V transversal fluctuations. The magnons interact with manganese and vanadium ions in a different way, and the magnons fluctuations suppress the M n and V ordered moments at different temperatures. As a result, the ferrimagnetic phase is divided into two phases: low temperature phase 0 < T < T * , where the magnetic orders of the M n and V ions contribute to the magnetization of the system, and high temperature phase (T * , T N ), where the vanadium magnetic order is suppressed by magnon fluctuations, and only the manganese ions have non-zero spontaneous magnetization. A modified spin-wave theory is developed to describe the two phases and to calculate the magnetization as a function ...

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confidence: 49%

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confidence: 57%

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confidence: 77%

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confidence: 94%

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confidence: 99%

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Ferrimagnetism of MnV₂O₄spinel

Karchev

2009

J. Phys.: Condens. Matter

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Magnetocaloric Materials with Multiple Instabilities

2017

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the cases of H = 0 and H ≠ 0. In the zero field, the entropy exhibits an anomaly at a ferromagnetic (or ferrimagnetic) transition temperature (T C ), where the slope changes. As a magnetic field is applied to the material at around T C , the fluctuation is suppressed and the entropy is reduced. By exploiting this effect and combining several processes to form a thermodynamic cycle, e.g., Brayton cycle (i)→(ii)→(iii)→(iv)→(i), [7] heat can be extracted from the magnetic material to the thermal bath.While there are several prerequisites (e.g., magnetic and thermal hysteresis properties, mechanical stability, etc.) for materials to be applied to magnetic refrigeration, the enhanced magnitude of the magnetocaloric effect is of primary importance. The magnitude of the magnetocaloric effect is usually evaluated as the isothermal entropy change ΔS = S(H, T) -S(H = 0, T), or adiabatic temperature change ΔT, which are illustrated in Figure 1a, for a given magnetic field change ΔH. In many cases, the isothermal entropy change ΔS is adopted to argue the magnetocaloric effect as it is easier to experimentally evaluate than the adiabatic temperature change ΔT. Here, ΔS is calculated from a series of MH curves with a fine temperature interval using the Maxwell relationRecent research on magnetocaloric materials has focused on first-order magnetic transition systems, rather than secondorder ones because of the enhanced magnitude of the magnetocaloric effect in the former class of materials. [1] In second-order transition systems, the entropy value itself is continuous as a function of temperature, and only its temperature derivative is discontinuous, as shown in the upper panel of Figure 1b. Thus, the entropy change -ΔS displays a triangular-like shape with broad tails at both the high-and low-temperature sides. In this case, the maximum value of -ΔS is generally not very large. On the other hand, in the case of the first-order transition, the entropy itself changes discontinuously at the transition temperature, and therefore, the isothermal entropy change -ΔS tends to be large in magnitude for a rather narrow range of temperatures, as illustrated in Figure 1c. At the same time, the temperature profile of -ΔS indicates a rectangular-like shape rather than the triangular shape in the case of the secondorder transition. Based on these arguments, first-order transition systems have more widely been investigated than secondorder transition systems. Representative examples showing the The magnetocaloric effect is a well-known phenomenon where the temperature of a magnetic material varies upon application or removal of a magnetic field. This effect is anticipated to be applied to magnetic refrigeration technology, which is environmentally benign. For practical applications, it is essential to explore and expand the materials horizon of novel magnets that exhibit giant magnetocaloric effects to achieve sufficient cooling efficiency. In this article, several attempts to enhance the magnetocaloric effect are reviewed from the viewpoint...

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Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

et al. 2021

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The manipulation of mesoscale domain wall phenomena has emerged as a powerful strategy for designing ferroelectric responses in functional devices, but its full potential is not yet realized in the field of magnetism. This work shows a direct connection between magnetic response functions in mechanically strained samples of Mn 3 O 4 and MnV 2 O 4 and stripe-like patternings of the bulk magnetization which appear below known magnetostructural transitions. Building off previous magnetic force microscopy data, a small-angle neutron scattering is used to show that these patterns represent distinctive magnetic phenomena which extend throughout the bulk of two separate materials, and further are controllable via applied magnetic field and mechanical stress. These results are unambiguously connected to the anomalously large magnetoelastic and magnetodielectric response functions reported for these materials, by performing susceptibility measurements on the same crystals and directly correlating local and macroscopic data.

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Magnetic and Orbital Ordering in the SpinelMnV2O4

Cited by 161 publications

References 17 publications

Ferrimagnetism of MnV₂O₄spinel

Ferrimagnetism of MnV₂O₄spinel

Magnetocaloric Materials with Multiple Instabilities

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

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Magnetic and Orbital Ordering in the SpinelMnV2O4

Cited by 161 publications

References 17 publications

Ferrimagnetism of MnV2O4spinel

Ferrimagnetism of MnV2O4spinel

Magnetocaloric Materials with Multiple Instabilities

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

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Product

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Ferrimagnetism of MnV₂O₄spinel

Ferrimagnetism of MnV₂O₄spinel