Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet

Abstract

Magnetic frustration in a chiral magnet stabilizes a new disordered skyrmion phase over an extended temperature region.

Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2Nakajima1, Karube2, Ishikawa3 et al. 2019Phys. Rev. B301200View full textAdd to dashboardCite

“…Note that the spin-glass state also appears in a x cited from Ref. [19]. The inset shows the crystal structure and two independent sites.…”

“…Figure 1(a) shows the x-T magnetic phase diagram cited from Ref. [19]. As mentioned above, the Mn substitution reduces T C .…”

“…Ternary alloys Co 10− x 2 Zn 10− x 2 Mn x (CZM) are skyrmionhost materials with β-Mn-type chiral cubic crystal structure belonging to the space group of P4 1 32 or P4 3 32 [16][17][18][19]. An end compound Co 10 Zn 10 shows long-period helimagnetic order below T C = 460 K (and a SkL phase as well in a magnetic field [20]), which indicates the existence of fairly large J [16,21].…”

Controlling the helicity of magnetic skyrmions by electrical field in frustrated magnets

“…In particular, topological vortex-like magnetic skyrmions, have attracted a great deal of interest from both the academic and technological fields [7,8]. Since the experimental discovery in 2009 [9], magnetic skyrmions have been observed in many different materials including metals [10][11][12], semiconductors [13][14][15], insulators [16,17], and thin film systems [18,19]. Besides the formation of independent skyrmion excitations in the ferromagnetic background, these skyrmions also crystallize into stable lattice, surviving even down to zero-temperature.…”

Increased lifetime of metastable skyrmions by controlled doping

“…The competition of this interaction with the ferromagnetic exchange and Zeeman interactions produces noncolinear spin textures such as the helical and conical states. In the presence of thermal fluctuations near T c [5], at particular values of crystal anisotropies [6], or with the addition of magnetic frustration [7], the magnetic SkL state is energetically favoured, forming a skyrmion lattice in a plane perpendicular to the direction of an applied magnetic field. In bulk materials, this lattice has an extended, string-like structure in the field direction, as illustrated in Fig.…”