Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Kevan, S. D."'
Autor:
Tumbleson, R., Morley, S. A., Hollingworth, E., Singh, A., Bayaraa, T., Burdet, N. G., Saleheen, A. U., McCarter, M. R., Raftrey, D., Pandolfi, R. J., Esposito, V., Dakovski, G. L., Decker, F. -J., Reid, A. H., Assefa, T. A., Fischer, P., Griffin, S. M., Kevan, S. D., Hellman, F., Turner, J. J., Roy, S.
A system that possesses translational symmetry but breaks orientational symmetry is known as a nematic phase. While there are many examples of nematic phases in a wide range of contexts, such as in liquid crystals, complex oxides, and superconductors
Externí odkaz:
http://arxiv.org/abs/2404.13212
Autor:
Lee, J. C. T, Mishra, S. K., Bhat, V. S., Streubel, R., Farmer, B., Shi, X., De Long, L. E., McNulty, I., Fischer, P., Kevan, S. D., Roy, S.
Publikováno v:
Phys. Rev. B 99, 024406 (2019)
We report evidence of spontaneous formation of a heterogeneous network of superdomains in two-dimensional square artificial spin ice nanostructures in externally applied magnetic fields. The magnetic heterogeneity is locally disordered but has a zig-
Externí odkaz:
http://arxiv.org/abs/1711.00182
Autor:
Montoya, S. A., Couture, S., Chess, J. J., Lee, J. C. T, Kent, N., Im, M. -Y., Kevan, S. D., Fischer, P., McMorran, B. J., Roy, S., Lomakin, V., Fullerton, E. E.
Publikováno v:
Phys. Rev. B 95, 224405 (2017)
The dynamic response of dipole skyrmions in Fe/Gd multilayer films is investigated by ferromagnetic resonance measurements and compared to micromagnetic simulations. We detail thickness and temperature dependent studies of the observed modes as well
Externí odkaz:
http://arxiv.org/abs/1702.04691
Autor:
Lee, J. C. T, Mishra, S. K., Bhat, V. S., Streubel, R., Farmer, B., Shi, X., De Long, L. E., McNulty, I., Fischer, P., Kevan, S. D., Roy, S.
We report direct evidence that magnetically charged superdomain walls form spontaneously in two dimensional square artificial spin ice nanostructures in response to external magnetic fields. These extended magnetic defects were revealed by the develo
Externí odkaz:
http://arxiv.org/abs/1609.07828
Autor:
Montoya, S. A., Couture, S., Chess, J. J., Lee, J. C. T., Kent, N., Henze, D., Sinha, S. K., Im, M. -Y., Kevan, S. D., Fischer, P., McMorran, B. J., Lomakin, V., Roy, S., Fullerton, E. E.
Publikováno v:
Phys. Rev. B 95, 024415 (2017)
The interesting physics and potential memory technologies resulting from topologically protected spin textures such as skyrmions, has prompted efforts to discover new material systems that can host these kind of magnetic structures. Here we use the h
Externí odkaz:
http://arxiv.org/abs/1608.01368
Autor:
Lee, J. C. T, Chess, J. J., Montoya, S. A., Shi, X., Tamura, N., Mishra, S. K., Fischer, P., McMorran, B. J., Sinha, S. K., Fullerton, E. E., Kevan, S. D., Roy, S.
We show that properly engineered amorphous Fe-Gd alloy thin films with perpendicular magnetic anisotropy exhibit room-temperature skyrmion molecules, or a pair of like-polarity, opposite-helicity skyrmions. Magnetic mirror symmetry planes present in
Externí odkaz:
http://arxiv.org/abs/1603.07882
Autor:
Langner, M. C., Roy, S., Mishra, S. K., Lee, J. C. T., Shi, X. W., Hossain, M. A., Chuang, Y. -D., Seki, S., Tokura, Y., Kevan, S. D., Schoenlein, R. W.
We report the observation of the skyrmion lattice in the chiral multiferroic insulator Cu2OSeO3 using Cu L3-edge resonant soft x-ray diffraction. We observe the unexpected existence of two distinct skyrmion sublattices that arise from inequivalent Cu
Externí odkaz:
http://arxiv.org/abs/1402.2947
Autor:
Pierce, M. S., Davies, J. E., Turner, J. J., Chesnel, K., Fullerton, E. E., Nam, J., Hailstone, R., Kevan, S. D., Kortright, J. B., Liu, Kai, Sorensen, L. B., York, B. R., Hellwig, O.
Publikováno v:
Physical Review B 87, 184428 (2013)
Using a combination of resonant soft x-ray scattering, magnetometry, x-ray reflectivity and microscopy techniques we have investigated the magnetic properties and microstructure of a series of perpendicular anisotropy Co/Pt multilayer films with resp
Externí odkaz:
http://arxiv.org/abs/1301.1737
Autor:
Turner, J. J., Thomas, K. J., Hill, J. P., Pfeifer, M., Chesnel, K., Tomioka, Y., Tokura, Y., Kevan, S. D.
The coupling of multiple degrees of freedom - charge, spin, and lattice - in manganites has mostly been considered at the microscopic level. However, on larger length scales, these correlations may be affected by strain and disorder, which can lead t
Externí odkaz:
http://arxiv.org/abs/0709.3558
Autor:
Pierce, M. S., Buechler, C. R., Sorensen, L. B., Kevan, S. D., Jagla, E. A., Deutsch, J. M., Mai, T., Narayan, O., Davies, J. E., Liu, Kai, Zimanyi, G. T., Katzgraber, H. G., Hellwig, O., Fullerton, E. E., Fischer, P., Kortright, J. B.
Publikováno v:
Phys. Rev. B 75, 144406 (2007)
Beautiful theories of magnetic hysteresis based on random microscopic disorder have been developed over the past ten years. Our goal was to directly compare these theories with precise experiments. We first developed and then applied coherent x-ray s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0611542