Antiferromagnetic domain wall motion in KNiF<sub>3</sub> and KCoF<sub>3</sub> observed by X-ray synchrotron topography

Safa, M.; Tanner, B. K.

doi:10.1080/01418637808225652

Cited by 42 publications

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References 14 publications

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“…The propagation directions and the polarizations of the pump pulses employed during the experiments are represented by the green pulses in the figure. netic anisotropy with positive sign of the anisotropy constant determines the alignment of spins along the [001], [010], and [100] axes. 38 The size of the domains was reported to be on the mm-scale, so that the spot size of our focused laser beams (70-100 µm) allows to interrogate a single domain in this material 39 . On the other hand the sublattice magnetization in K 2 NiF 4 is parallel to the c-axis, due a single-axis anisotropy.…”

Section: B Materialsmentioning

confidence: 99%

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Laser-driven quantum magnonics and terahertz dynamics of the order parameter in antiferromagnets

et al. 2019

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The impulsive generation of two-magnon modes in antiferromagnets by femtosecond optical pulses, so-called femto-nanomagnons, leads to coherent longitudinal oscillations of the antiferromagnetic order parameter that cannot be described by a thermodynamic Landau-Lifshitz approach. We argue that this dynamics is triggered as a result of a laser-induced modification of the exchange interaction. In order to describe the oscillations we have formulated a quantum mechanical description in terms of magnon pair operators and coherent states. Such an approach allowed us to derive an effective macroscopic equation of motion for the temporal evolution of the antiferromagnetic order parameter. An implication of the latter is that the photo-induced spin dynamics represents a macroscopic entanglement of pairs of magnons with femtosecond period and nanometer wavelength. By performing magneto-optical pump-probe experiments with 10 femtosecond resolution in the cubic KNiF 3 and the uniaxial K 2 NiF 4 collinear Heisenberg antiferromagnets, we observed coherent oscillations at the frequency of 22 THz and 16 THz, respectively. The detected frequencies as a function of the temperature fit the two-magnon excitation up to the Néel point. The experimental signals are described as dynamics of magnetic linear dichroism due to longitudinal oscillations of the antiferromagnetic vector.

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Section: B Materialsmentioning

confidence: 99%

“…39), we can directly relate the longitudinal dynamics of the Néel vector with the coherent parameters. Combining Eqs (39),(32). and(23) we obtain:…”

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confidence: 99%

Laser-driven quantum magnonics and terahertz dynamics of the order parameter in antiferromagnets

et al. 2019

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“…I n a previous publication [3] it was tentatively suggest'ed that the origin of the restoring force might be associated with long-range interactions between adjacent domain walls. Such a n interaction might arise from bhe difficulty of turning spins in the bulk of the doniain against the potential energy hill associated with the magnetocrystalline anisot'ropy.…”

Section: Discussionmentioning

confidence: 99%

“…A (100) platelet, cut from the same crystal as used in magnetic field studies [3], was mechanically ground so that its opposite (001) faces were flat and parallel. Strain thus introduced was removed by etching for several hours in HF.…”

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confidence: 99%

Antiferromagnetic domain wall motion under external stress

Clark

Tanner

1980

Phys. Stat. Sol. (a)

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Synchrotron X‐radiation topography is used to observe directly the movement of antiferromagnetic (a.f.) domain walls in KCoF3 at 77 K under an external stress. X‐ray rocking curves are used to provide additional numerical data on the stress at which a single domain crystal is obtained. Results are in qualitative agreement with the prediction of Néel's theory of af domain wall motion, and are consistent with magnetic field measurements performed on the same samples. A magnetoelastic origin for the restoring force on domain walls is discussed in the light of double crystal X‐ray diffraction results.

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“…Although the antiferromagnetic phase has low magnetic susceptibility, the magnetic-field-induced changes of domain structures in KNiF 3 and KCoF 3 antiferromagnetic compounds were delicately examined by x-ray topography. 7 Moreover, the magnetic shape-memory effect ͑MSME͒ and MFIS were even observed in a well-known superconductor LaSrCuO ͑Ref. 8͒ and a polycrystalline MnFeCu, 9 respectively, which were also attributed to the reorientation of antiferromagnetic variants.…”

Section: Evidence For Preferential Rearrangements Of Martensite Variamentioning

confidence: 99%

Evidence for preferential rearrangements of martensite variants by magnetic field in antiferromagnetic CoO crystal

Nie

Ren

Terai

et al. 2009

Applied Physics Letters

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Lanthanide contraction effect on crystal structures, magnetic, and dielectric properties in ordered double perovskites LnPbCoSbO6 (Ln = La, Pr, Nd)The synchrotron high-energy x-ray diffraction provides the direct crystallographic evidence for the magnetic-field-driven preferential rearrangements of martensite multivariants in antiferromagnetic CoO crystal. When a magnetic field was incrementally applied up to 6 T on the CoO single crystal cooled below the Néel temperature, the martensite variants with the magnetization easy-axis parallel to the magnetic field direction ͑H ជ ͒ were consumed, while the variants with magnetic moments perpendicular to H ជ were enhanced. The microscopic origin for the observation is discussed, which provides important information for understanding the magnetic-field-driven strain observed in the antiferromagnetic alloys, with a selection principle on martensite variants different from that found in the ferromagnetic shape memory alloys.

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Antiferromagnetic domain wall motion in KNiF₃ and KCoF₃ observed by X-ray synchrotron topography

Cited by 42 publications

References 14 publications

Laser-driven quantum magnonics and terahertz dynamics of the order parameter in antiferromagnets

Laser-driven quantum magnonics and terahertz dynamics of the order parameter in antiferromagnets

Antiferromagnetic domain wall motion under external stress

Evidence for preferential rearrangements of martensite variants by magnetic field in antiferromagnetic CoO crystal

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Antiferromagnetic domain wall motion in KNiF3 and KCoF3 observed by X-ray synchrotron topography

Cited by 42 publications

References 14 publications

Laser-driven quantum magnonics and terahertz dynamics of the order parameter in antiferromagnets

Laser-driven quantum magnonics and terahertz dynamics of the order parameter in antiferromagnets

Antiferromagnetic domain wall motion under external stress

Evidence for preferential rearrangements of martensite variants by magnetic field in antiferromagnetic CoO crystal

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Antiferromagnetic domain wall motion in KNiF₃ and KCoF₃ observed by X-ray synchrotron topography