PIEZOMAGNETISM AND DOMAINS IN MnF<sub>2</sub>

Baruchel, J.; Draperi, A.; Kadiri, Mohamed El; Fillion, G.; Maeder, M.; Molho, P.; Porteseil, J.L.

doi:10.1051/jphyscol:19888859

Cited by 13 publications

(5 citation statements)

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“…That this state has not fully converted to the +TR state by a field of +20 T indicates that either this TR state is pinned, or that the switching field in this domain is larger than 20 T. The robustness of minority domains to field-conversion may be closely related to the exceptionally hard piezomagnetic response of UO 2 . Interestingly, the presence of two 180°a ntiferromagnetic domains has been observed before in another piezomagnet, MnF 2 , via polarized neutron tomography 25,26 . Furthermore, the domain configuration was determined to be sensitive to the strain condition of the specimen.…”

Section: Results and Disscusionsupporting

confidence: 62%

Piezomagnetic switching and complex phase equilibria in uranium dioxide

et al. 2021

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Actinide materials exhibit strong spin–lattice coupling and electronic correlations, and are predicted to host new emerging ground states. One example is piezomagnetism and magneto-elastic memory effect in the antiferromagnetic Mott-Hubbard insulator uranium dioxide, though its microscopic nature is under debate. Here, we report X-ray diffraction studies of oriented uranium dioxide crystals under strong pulsed magnetic fields. In the antiferromagnetic state a [888] Bragg diffraction peak follows the bulk magnetostriction that expands under magnetic fields. Upon reversal of the field the expansion turns to contraction, before the [888] peak follows the switching effect and piezomagnetic ‘butterfly’ behaviour, characteristic of two structures connected by time reversal symmetry. An unexpected splitting of the [888] peak is observed, indicating the simultaneous presence of time-reversed domains of the 3-k structure and a complex magnetic-field-induced evolution of the microstructure. These findings open the door for a microscopic understanding of the piezomagnetism and magnetic coupling across strong magneto-elastic interactions.

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Section: Results and Disscusionsupporting

confidence: 62%

Piezomagnetic switching and complex phase equilibria in uranium dioxide

et al. 2021

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“…a magnetic moment results from an applied uniaxial stress, its magnitude being proportional to the stress [24]. The experiment described on Figure 14 [41], as well as previous ones [32,42], appear to be in agreement with a field-domain interaction mechanism based on piezomagnetism: the sign of the piezomagnetic coefficients is opposite for the two types of domains, and consequently the same occurs for the resulting magnetic moment in the presence of stress. The simultaneous application of a field and unaxial stress can thus modify the 180 0 antiferromagnetic domain patterns.…”

Section: Neutron Topography and Antiferromagnetic Domainssupporting

confidence: 69%

Neutron Diffraction Topographic Investigations of “Exotic” Magneticdomains

Baruchel

Schlenker

Palmer

1990

Nondestructive Testing and Evaluation

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Neutron diffraction topography provides unique possibilities for the direct observation and characterization of magnetic domains of various kinds in single crystals. The magnetic contribution to the scattering amplitude can lead to different intensities being diffracted, on a given Bragg peak, by the different domains. hence to area contrast on the topographs. Over the last few years some experience has been gained on the behaviour of the magnetic domains in colinear and helical antiferromagncts. While some (domains in NiO and in Cr) can be imaged indirectly by other methods, they can only be imaged in a direct way using neutron topography. and most of them cannot be observed by any other technique (180· domains in MnF" CoF, and a-Fe,O" chirality domains in helimagnetic Tb, Ho and MoP). A few conclusions on shapes, volume and reproducibility ("memory effect") of these domains were drawn from the results, and are discussed.

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“… 44 ), which should exist at the boundary we observed. With our optical resolution (200 μm), these substructures are averaged out, and one can only see the vertically averaged distributions at larger scales, which is supported not only by the magnetic ordering but also by the other macroscopic effect such as the associated lattice distortion 45 . As the symmetry requirement for the selective heating does not rely on the domain size, but rather on the magnetic crystalline symmetry, it should be applicable to these micro domains as well.…”

Section: Discussionmentioning

confidence: 99%

Control of antiferromagnetic domain distribution via polarization-dependent optical annealing

Higuchi

Kuwata‐Gonokami

2016

Nat Commun

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The absence of net magnetization inside antiferromagnetic domains has made the control of their spatial distribution quite challenging. Here we experimentally demonstrate an optical method for controlling antiferromagnetic domain distributions in MnF2. Reduced crystalline symmetry can couple an order parameter with non-conjugate external stimuli. In the case of MnF2, time-reversal symmetry is macroscopically broken reflecting the different orientations of the two magnetic sublattices. Thus, it exhibits different absorption coefficients between two orthogonal linear polarizations below its antiferromagnetic transition temperature under an external magnetic field. Illumination with linearly polarized laser light under this condition selectively destructs the formation of a particular antiferromagnetic order via heating. As a result, the other antiferromagnetic order is favoured inside the laser spot, achieving spatially localized selection of an antiferromagnetic order. Applications to control of interface states at antiferromagnetic domain boundaries, exchange bias and control of spin currents are expected.

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PIEZOMAGNETISM AND DOMAINS IN MnF₂

Cited by 13 publications

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Piezomagnetic switching and complex phase equilibria in uranium dioxide

Piezomagnetic switching and complex phase equilibria in uranium dioxide

Neutron Diffraction Topographic Investigations of “Exotic” Magneticdomains

Control of antiferromagnetic domain distribution via polarization-dependent optical annealing

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PIEZOMAGNETISM AND DOMAINS IN MnF2

Cited by 13 publications

References 0 publications

Piezomagnetic switching and complex phase equilibria in uranium dioxide

Piezomagnetic switching and complex phase equilibria in uranium dioxide

Neutron Diffraction Topographic Investigations of “Exotic” Magneticdomains

Control of antiferromagnetic domain distribution via polarization-dependent optical annealing

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PIEZOMAGNETISM AND DOMAINS IN MnF₂