RIKEN Center for Emergent Matter Science Emergent Functional Magnetic Materials Research Unit

Unit Leader: Kosuke Karube (Ph.D.)

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Research Summary

Our unit aims to develop new magnetic materials with topological functions and high-performance magnetic functions based on materials synthesis. We will develop topological magnetic materials and ferromagnetic/antiferromagnetic materials in intermetallic and oxide compounds and elucidate their magnetic structures and topological properties through various measurement techniques such as magnetometry, scanning probe microscopy, and neutron scattering.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Engineering
Interdisciplinary Science & Engineering
Metallic material properties-related
Applied physical properties-related
Inorganic compounds and inorganic materials chemistry-related

Keywords

Magnetism
Strongly correlated electron systems
Skyrmions
Alloys

Selected Publications

1. Karube, K., Ukleev, V., Kagawa, F., Tokura, Y., Taguchi, Y., and White, J. S.:
"Unveiling the anisotropic fractal magnetic domain structure in bulk crystals of antiskyrmion host (Fe,Ni,Pd)₃P by small-angle neutron scattering"
Journal of Applied Crystallography 55, 1392 (2022).
2. White, J. S., Karube, K., Ukleev, V., Derlet, P. M., Cubitt, R., Dewhurst, C. D., Wildes, A. R., Yu, X. Z., Ronnow, H. M., Tokura, Y., and Taguchi, Y.:
"Small-angle neutron scattering study of mesoscale magnetic disordering and skyrmion phase suppression in the frustrated chiral magnet Co_6.75Zn_6.75Mn_6.5"
Journal of Applied Crystallography 55, 1219 (2022).
3. Karube, K., and Taguchi, Y.:
"High-temperature non-centrosymmetric magnets for skyrmionics"
APL Materials 10, 080902 (2022).
4. Karube, K., Peng, L. C., Masell, J., Hemmida, M., Krug von Nidda, H.-A., Kezsmarki, I., Yu, X. Z., Tokura, Y., and Taguchi, Y.:
"Doping Control of Magnetic Anisotropy for Stable Antiskyrmion Formation in Schreibersite (Fe,Ni)₃P with S₄ symmetry"
Advanced Materials 34, 2108770 (2022).
5. Karube, K., Peng, L. C., Masell, J., Yu, X. Z., Kagawa, F., Tokura, Y., and Taguchi, Y.:
"Room-temperature antiskyrmions and sawtooth surface textures in a non-centrosymmetric magnet with S₄ symmetry"
Nature Materials 20, 335 (2021).
6. Karube, K., White, J. S., Ukleev, V., Dewhurst, C. D., Cubitt, R., Kikkawa, A., Tokunaga, Y., Ronnow, H. M., Tokura, Y., and Taguchi, Y.:
"Metastable skyrmion lattices governed by magnetic disorder and anisotropy in β-Mn-type chiral magnets"
Physical Review B 102, 064408 (2020).
7. Karube, K., Shibata, K., White, J. S., Koretsune, T., Yu, X. Z., Tokunaga, Y., Ronnow, H. M., Arita, R., Arima, T., Tokura, Y., and Taguchi, Y.:
"Controlling the helicity of magnetic skyrmions in a β-Mn-type high-temperature chiral magnet"
Physical Review B 98, 155120 (2018).
8. Karube, K., White, J. S., Morikawa, D., Dewhurst, C. D., Cubitt, R., Kikkawa, A., Yu, X. Z., Tokunaga, Y., Arima, T., Ronnow, H. M., Tokura, Y., and Taguchi, Y.:
"Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet"
Science Advances 4, eaar7043 (2018).
9. Karube, K., White, J. S., Morikawa, D., Bartkowiak, M., Kikkawa, A., Tokunaga, Y., Arima, T., Ronnow, H. M., Tokura, Y., and Taguchi, Y.:
"Skyrmion formation in a bulk chiral magnet at zero magnetic field and above room temperature"
Physical Review Materials 1, 074405 (2017).
10. Karube, K., White, J. S., Reynolds, N., Gavilano, J. L., Oike, H., Kikkawa, A., Kagawa, F., Tokunaga, Y., Ronnow, H. M., Tokura, Y., and Taguchi, Y.:
"Robust metastable skyrmions and their triangular-square lattice structural transition in a high-temperature chiral magnet"
Nature Materials 15, 1237 (2016).

Lab Members

Principal investigator

Kosuke Karube: Unit Leader

Contact Information

Frontier Research Laboratory
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: kosuke.karube [at] riken.jp