Magnetostriction of helimagnets in the skyrmion crystal phase

Wang, Shasha; Hu, Yangfan; Tang, Jin; Wei, Wensen; Cong, Junzhuang; Sun, Young; Du, Haifeng; Tian, Mingliang

doi:10.1088/1367-2630/ab5ec2

Cited by 5 publications

References 39 publications

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Magnetostriction related to skyrmion-lattice formation in chiral magnet FeGe

Mito,

Tajiri,

Kousaka

et al. 2024

Journal of Applied Physics

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The B20 type chiral magnet FeGe exhibits the formation of skyrmion-lattice (SkL) phases in the vicinity of the magnetic ordering temperature. The SkL is a magnetic superlattice composed of vortex-type topological spin objects, and it has experimentally been known that its formation requires the existence of an intermediate (IM) phase between SkL and the paramagnetic (PM) phases. We take interest in how the crystal lattice experiences the formation of these topological spin texture. In this study, we observed the so-called spin–orbit coupling induced magnetostriction related to these topological spin texture formation, in addition to the ac magnetization anomalies. The temperature and magnetic field dependences of the lattice parameter reflected the transformation of phases, such as helimagnetic (HM), SkL, IM, conical (CM), and PM phases. In the PM region, a phase characterized as gaseous skyrmions was detected similarly to the case of the same B20 type MnSi. Furthermore, the HM, CM, and IM phases were also divided into two regions. Thus, the precise phase diagram near Tc was reconstructed from the prospect of the magnetostriction such that we demonstrated that the stabilization of skyrmions needs a finite magnetic field.

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Magnetostriction related to skyrmion-lattice formation in chiral magnet FeGe

Mito,

Tajiri,

Kousaka

et al. 2024

Journal of Applied Physics

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Spontaneous magnetostriction effects in the chiral magnet CrNb3S6

et al. 2020

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Paramagnetic magnetostriction in the chiral magnet CrNb3S6 at room temperature

et al. 2022

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We report that the magnetostriction (MS) eects occur in a paramagnetic state of a chiral magnet CrNb3S6. Through a series of experimental tests at room temperature, structural changes were observed at the level of a unit cell. The structural parameters are dependent of the strength and direction of magnetic eld (H) even at temperature excessively higher than the magnetic ordering temperature Tc of 127 K. The present paramagnetic MS prominently appeared under H== the abplane (easy plane) as opposed to under H== the c-axis. Features observed in the paramagnetic MS eect signicantly dier from those of the spontaneous MS in the vicinity of Tc [Phys. Rev. B102, 014446 (2020)]. In this material, the orbital angular momentum L of Cr originates from the hybridization between Cr and Nb, and L is strongly coupled with the crystal structure [Phys. Rev. B99, 174439 (2019)]. The present study claried that the symmetry of the CrS6 octahedron is sensitive to H even at room temperature. The paramagnetic spin-orbit coupling should induce the distortion of CrS6 octahedron, resulting in the changes in Cr-Nb(4f) distance via the change in the hybridization between Cr-a1g and Nb-4d z 2 orbitals.

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Magnetostriction of helimagnets in the skyrmion crystal phase

Cited by 5 publications

References 39 publications

Magnetostriction related to skyrmion-lattice formation in chiral magnet FeGe

Magnetostriction related to skyrmion-lattice formation in chiral magnet FeGe

Spontaneous magnetostriction effects in the chiral magnet CrNb3S6

Paramagnetic magnetostriction in the chiral magnet CrNb3S6 at room temperature

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