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DESCRIPTION:Kotaro Shimizu\, University of Tokyo\n\n
Swirling spin textures\, such as helices and vortices\, appear in
chiral magnets\, and these noncolinear \;and noncoplaner \;spin t
extures bring about characteristic resonance structures and quantum transp
orts. Recently\, a one-dimensional chiral magnet hosting a conical spin te
xture and a chiral soliton lattice (CSL) have attracted a lot of interest&
nbsp\;since resonance frequencies as well as a magnetic modulation period
can be flexibly controlled by an external magnetic field [1\,2]. However\,
the dynamical properties of these spin textures associated with the oscil
lating magnetic field and the resultant emergent electromagnetic phenomena
have not been systematically clarified. \;
\n\n \;
\n\n
In this study\, we theoretically study the res
onance modes and the emergent electromagnetic phenomena in a one-dimension
al chiral magnet by \;numerically solving the Landau-Lifshitz-Gilbert
equation (LLG eq.) and by using the linear spin wave theory. We systematic
ally clarified the magnon band structure by varying the external magnetic
field and find that the band gaps increase with the magnetic field perpend
icular to the chiral axis. We also find the edge modes appear within the b
and gap and clarify that the swirling spin textures penetrate into the sys
tem from the edges by activating the edge modes. In the talk\, we will als
o discuss the enhancement of the emergent electric phenomena and AC magnet
ic field drive of swirling spin textures.
\
n
DTSTART:20230216T210000Z
LOCATION:Claude Moore Nursing\, Room G120
SUMMARY:Theoretical study on the spin dynamics induced by a magnetic field
in a one-dimensional chiral magnet
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