Piezomagnetism in the Ising ferromagnet URhGe
arxiv(2024)
摘要
Piezomagnetism, linear response between strain and magnetic field, is
relatively unexplored cross-correlation but has promising potential as a novel
probe of time-reversal-symmetry breaking in various classes of materials.
Interestingly, there has been no report of piezomagnetism in ferromagnets, most
archetypal time-reversal-symmetry-broken materials. This half-century absence
of piezomagnetic ferromagnets is attributable to complications originating from
multiple-domain states, as well as from changes in the magnetic point group by
rotation of magnetic moment. Here, we report characteristic V-shaped
magnetostriction in the Ising itinerant ferromagnet URhGe, observed by
simultaneous multi-axis strain measurement technique utilizing optical fiber
Bragg grating sensors. This novel magnetostriction occurs only under fields
along the c axis and does not scale with the square of magnetization. Such
unconventional feature indicates piezomagnetism as its origin. Our observation,
marking the first report of piezomagnetism in ferromagnets, is owing to the
mono-domain switching and the Ising magnetization. The obtained piezomagnetic
coefficients are fairly large, implying that Ising ferromagnets are promising
frontiers when seeking for materials with large piezomagnetic responses.
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