Trans-Scale Quantum Science Institute

Events

【10/23】Lecture by Dr. Kamran Behnia(ESPCI Paris)

seminar

We are pleased to inform you that the seminar will be held as follows.
Please see below for details. We look forward to your participation.

Title:Magnetostriction, piezomagnetism and domain nucleation in Mn3Sn
Speaker:Dr. Kamran Behnia
    ESPCI Paris
    Paris Science et Lettres University
Day:2024年10月23日(水)15:00~16:00
Venue:東京大学理学部1号館206号室

Whenever the elastic energy of a solid depends on magnetic field, there is a magnetostrictive response. Field-linear magnetostriction implies piezomagnetism and vice versa. Mn3Sn, a recently discovered non-collinear antiferromanget with Weyl nodes, hosts a large and almost perfectly linear magnetostriction even at room temperature. Its magnitude is in agreement with recently reported piezomagnetic data. We show that linear magnetostriction and piezomagnetism are both driven by the field-induced in-plane twist of spins provide that one takes into account the presnece of Sn vacancies. The field-induced domain nucleation within the hysteresis loop corresponds to a phase transition. Within the hysteresis loop, a concomitant mesoscopic modulation of local strain and spin twist angles leads to twisto-magnetic stripes.