TEM studies of domain formation mechanisms in MnV2O4

Murakami, Yasukazu; Nii, Yoichi; Arima, T.; Shindo, Daisuke; Yanagisawa, K.; Tonomura, Akira

doi:10.1016/j.jallcom.2012.02.031

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…[18] Often these low-temperature states are characterized by giant magnetoelastic and magnetodielectric response functions, [19][20][21][22][23][24] though reports are inconsistent and there is very little agreement as to the origin of these behaviors. Recent studies by members of our collaboration using magnetic force microscopy (MFM) [25] and others using transmission electron microscopy (TEM) [26,27] have revealed the existence of stripe-like magnetization domains in the same temperature region in some spinels when subjected to applied stress. Initial estimates indicate proper consideration of these stripe-like domains is essential to account for the magnitude of the bulk magnetization data in the same crystals, [25] though it is difficult to make quantitative predictions based on surface investigations alone.…”

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confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

et al. 2021

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Application of strain to orbital-spin-coupled system MnV₂O₄at cryogenic temperatures within a transmission electron microscope

et al. 2016

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The impact of mechanical stress on the morphology of crystallographic and magnetic domains in shape-controlled specimens of an orbital-spin-coupled system, MnV2O4, was examined by cryogenic Lorentz microscopy. Because of the difference in thermal expansion coefficients of MnV2O4 and the supporting Mo mesh, compression on the order of 0.01% was applied to the thin-foil specimens near the structural/magnetic phase transformation temperatures. The extent of compression was comparable to the lattice striction associated with the cubic-to-tetragonal phase transformation in MnV2O4 The applied strain thus clearly influenced the morphology of crystallographic domains (i.e. twinning configuration in the tetragonal phase) produced during cooling. The magnetic domain structure was entirely dependent on the configuration of twinning in the tetragonal phase. The observations in this study provided useful information for understanding the relationship between the crystallographic domains and the magnetic domains in MnV2O4.

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Pressure control of magnetic order and excitations in the pyrochlore antiferromagnet MgCr2O4

Nassar,

Lane,

Haberl

et al. 2024

Phys. Rev. B

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MgCr2O4 is one of the best-known realizations of the pyrochlore-lattice Heisenberg antiferromagnet. The strong antiferromagnetic exchange interactions are perturbed by small further-neighbor exchanges such that this compound may in principle realize a spiral spin liquid (SSL) phase in the zero-temperature limit. However, a spin Jahn-Teller transition below TN≈13 K yields a complicated long-range magnetic order with multiple coexisting propagation vectors. We present neutron scattering and thermomagnetic measurements of MgCr2O4 samples under applied hydrostatic pressure up to P=1.7 GPa demonstrating the existence of multiple close-lying nearly degenerate magnetic ground states. We show that the application of hydrostatic pressure increases the ordering temperature by around 0.8 K per GPa and increases the bandwidth of the magnetic excitations by around 0.5 meV per GPa. We also evidence a strong tendency for the preferential occupation of a subset of magnetic domains under pressure. In particular, we show that the k=(0,0,1) magnetic phase, which is almost negligible at ambient pressure, dramatically increases in spectral weight under pressure. This modifies the spectrum of magnetic excitations, which we interpret unambiguously as spin waves from multiple magnetic domains. Moreover, we report that the application of pressure reveals a feature in the magnetic susceptibility above the magnetostructural transition. We interpret this as the onset of a short-range ordered phase associated with k=(0,0,1), previously not observed in magnetometry measurements. Published by the American Physical Society 2024

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TEM studies of domain formation mechanisms in MnV2O4

Cited by 3 publications

References 19 publications

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

Application of strain to orbital-spin-coupled system MnV₂O₄at cryogenic temperatures within a transmission electron microscope

Pressure control of magnetic order and excitations in the pyrochlore antiferromagnet MgCr2O4

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TEM studies of domain formation mechanisms in MnV2O4

Cited by 3 publications

References 19 publications

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

Application of strain to orbital-spin-coupled system MnV2O4at cryogenic temperatures within a transmission electron microscope

Pressure control of magnetic order and excitations in the pyrochlore antiferromagnet MgCr2O4

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Application of strain to orbital-spin-coupled system MnV₂O₄at cryogenic temperatures within a transmission electron microscope