magnetoelectric; spectroscopy; neutron scattering; skyrmion; magnetic insulator; multiferroic; transition-metal oxide
Karube K., White J. S., Ukleev V., Dewhurst C. D., Cubitt R., Kikkawa A., Tokunaga Y., Rønnow H. M., Tokura Y., Taguchi Y. (2020), Metastable skyrmion lattices governed by magnetic disorder and anisotropy in β -Mn-type chiral magnets, in
Physical Review B, 102(6), 064408-064408.
Crisanti M., Reynolds N., Živković I., Magrez A., Rønnow H. M., Cubitt R., White J. S. (2020), In situ control of the helical and skyrmion phases in Cu2OSeO3 using high-pressure helium gas up to 5 kbar, in
Physical Review B, 101(21), 214435-214435.
Ueda H., Onoda S., Yamaguchi Y., Kimura T., Yoshizawa D., Morioka T., Hagiwara M., Hagihala M., Soda M., Masuda T., Sakakibara T., Tomiyasu K., Ohira-Kawamura S., Nakajima K., Kajimoto R., Nakamura M., Inamura Y., Reynolds N., Frontzek M., White J.S., Hase M., Yasui Y. (2020), Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-1/2 ladder, in
Physical Review B, 101(14), 140408-140408.
Ishiwata S., Nakajima T., Kim J.-H., Inosov D. S., Kanazawa N., White J. S., Gavilano J. L., Georgii R., Seemann K. M., Brandl G., Manuel P., Khalyavin D. D., Seki S., Tokunaga Y., Kinoshita M., Long Y. W., Kaneko Y., Taguchi Y., Arima T., Keimer B., Tokura Y. (2020), Emergent topological spin structures in the centrosymmetric cubic perovskite SrFeO3, in
Physical Review B, 101(13), 134406-134406.
Okuyama D., Bleuel M., White J. S., Ye Q., Krzywon J., Nagy G., Im Z. Q., Živković I., Bartkowiak M., Rønnow H. M., Hoshino S., Iwasaki J., Nagaosa N., Kikkawa A., Taguchi Y., Tokura Y., Higashi D., Reim J. D., Nambu Y., Sato T. J. (2019), Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow, in
Communications Physics, 2(1), 79-79.
Nakajima T., Karube K., Ishikawa Y., Yonemura M., Reynolds N., White J. S., Rønnow H. M., Kikkawa A., Tokunaga Y., Taguchi Y., Tokura Y., Arima T. (2019), Correlation between site occupancies and spin-glass transition in skyrmion host Co10−x2Zn10−x2Mnx, in
Physical Review B, 100(6), 064407-064407.
Reynolds N., Mannig A., Luetkens H., Baines C., Goko T., Scheuermann R., Keller L., Bartkowiak M., Fujimura A., Yasui Y., Niedermayer Ch., White J. S. (2019), Magnetoelectric coupling without long-range magnetic order in the spin-1/2 multiferroic Rb2Cu2Mo3O12, in
Physical Review B, 99(21), 214443-214443.
Sakai H., Yokoyama S., Kuwabara A., White J. S., Canévet E., Rønnow H. M., Koretsune T., Arita R., Miyake A., Tokunaga M., Tokura Y., Ishiwata S. (2018), Negative-pressure-induced helimagnetism in ferromagnetic cubic perovskites Sr1−xBaxCoO3, in
Physical Review Materials, 2(10), 104412-104412.
Karube K., Shibata K., White J. S., Koretsune T., Yu X. Z., Tokunaga Y., Rønnow H. M., Arita R., Arima T., Tokura Y., Taguchi Y. (2018), Controlling the helicity of magnetic skyrmions in a β -Mn-type high-temperature chiral magnet, in
Physical Review B, 98(15), 155120-155120.
Leo N., Carolus V., White J. S., Kenzelmann M., Hudl M., Tolédano P., Honda T., Kimura T., Ivanov S. A., Weil M., Lottermoser Th., Meier D., Fiebig M. (2018), Magnetoelectric inversion of domain patterns, in
Nature, 560(7719), 466-470.
White J.S., Živković I., Kruchkov A.J., Bartkowiak M., Magrez A., Rønnow H.M. (2018), Electric-Field-Driven Topological Phase Switching and Skyrmion-Lattice Metastability in Magnetoelectric Cu2OSeO3, in
Phys. Rev. Applied, 10, 014021.
Bordács S., Farkas D. G., White J. S., Cubitt R., DeBeer-Schmitt L., Ito T., Kézsmárki I. (2018), Magnetic Field Control of Cycloidal Domains and Electric Polarization in Multiferroic BiFeO3, in
Physical Review Letters, 120(14), 147203-147203.
Takagi R., Yu X. Z., White J. S., Shibata K., Kaneko Y., Tatara G., Rønnow H. M., Tokura Y., Seki S. (2018), Low-Field Bi-Skyrmion Formation in a Noncentrosymmetric Chimney Ladder Ferromagnet, in
Physical Review Letters, 120(3), 037203-037203.
White J. S., Butykai Á., Cubitt R., Honecker D., Dewhurst C. D., Kiss L. F., Tsurkan V., Bordács S. (2018), Direct evidence for cycloidal modulations in the thermal-fluctuation-stabilized spin spiral and skyrmion states of GaV4S8, in
Physical Review B, 97(2), 020401-020401.
Kanazawa N., White J. S., Rønnow H. M., Dewhurst C. D., Morikawa D., Shibata K., Arima T., Kagawa F., Tsukazaki A., Kozuka Y., Ichikawa M., Kawasaki M., Tokura Y. (2017), Topological spin-hedgehog crystals of a chiral magnet as engineered with magnetic anisotropy, in
Physical Review B, 96(22), 220414-220414.
Karube K., White J. S., Morikawa D., Bartkowiak M., Kikkawa A., Tokunaga Y., Arima T., Rønnow H. M., Tokura Y., Taguchi Y. (2017), Skyrmion formation in a bulk chiral magnet at zero magnetic field and above room temperature, in
Physical Review Materials, 1(7), 074405-074405.
Bordács S., Butykai A., Szigeti B. G., White J. S., Cubitt R., Leonov A. O., Widmann S., Ehlers D., von Nidda H.-A. Krug, Tsurkan V., Loidl A., Kézsmárki I. (2017), Equilibrium Skyrmion Lattice Ground State in a Polar Easy-plane Magnet, in
Scientific Reports, 7(1), 7584-7584.
Honda T., White J. S., Harris A. B., Chapon L. C., Fennell A., Roessli B., Zaharko O., Murakami Y., Kenzelmann M., Kimura T. (2017), Coupled multiferroic domain switching in the canted conical spin spiral system Mn2GeO4, in
Nature Communications, 8, 15457-15457.
Karube K., White J. S., Reynolds N., Gavilano J. L., Oike H., Kikkawa A., Kagawa F., Tokunaga Y., Rønnow H. M., Tokura Y., Taguchi Y. (2016), Robust metastable skyrmions and their triangular–square lattice structural transition in a high-temperature chiral magnet, in
Nature Materials, 15(12), 1237-1242.
Kanazawa N., White J. S., Rønnow H. M., Dewhurst C. D., Fujishiro Y., Tsukazaki A., Kozuka Y., Kawasaki M., Ichikawa M., Kagawa F., Tokura Y. (2016), Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films, in
Physical Review B, 94(18), 184432-184432.
Kézsmárki I., Bordács S., Milde P., Neuber E., Eng L. M., White J. S., Rønnow H. M., Dewhurst C. D., Mochizuki M., Yanai K., Nakamura H., Ehlers D., Tsurkan V., Loidl A. (2015), Néel-type skyrmion lattice with confined orientation in the polar magnetic semiconductor GaV4S8, in
Nature Materials, 14(11), 1116-1122.
This project is concerned principally with the discovery and parametrization of new functionalities in magnetic materials that display magnetoelectric (ME) coupling effects. ME coupling permits the mutual control of both of a material’s magnetic and electric properties by just a single magnetic or electric field. In particular, the electric field control of magnetism is of intense interest to researchers, because it is more energy efficient than the usual control of magnetic properties by magnetic fields. The first frontier of our research into ME materials concerns the ME coupling between electric fields and magnetic skyrmions in the recently discovered skyrmion-lattice materials. Here we aim to parameterize the ME coupling and the skyrmions, and subsequently engineer the coupling to seek enhanced ME coupling effects. The second frontier of the research concerns an exceedingly rare class of ME material, that which displays simultaneous electric and ferromagnetic order. Here, we will clarify the basic interactions underpinning this rare state, and also study the associated class of novel ME electromagnon excitations. Further new materials with properties relevant to the two topics will also be studied.