M
M. Uehara
Publications - 8
Citations - 157
M. Uehara is an academic researcher. The author has contributed to research in topics: Quantum tunnelling & Magnetization. The author has an hindex of 5, co-authored 8 publications receiving 153 citations.
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Journal ArticleDOI
Quantum tunneling in magnetic systems of various sizes (invited)
Bernard Barbara,Luiz C. Sampaio,J. E. Wegrowe,B. A. Ratnam,A. Marchand,C. Paulsen,Miguel A. Novak,J.L. Tholence,M. Uehara,D. Fruchart +9 more
TL;DR: In this article, the results of magnetic relaxation experiments are shown to agree with theoretical predictions of quantum tunneling of the magnetization, and the authors emphasize the study of low temperature relaxation in ferromagnetic nanoparticles, layers, and multilayers (including domain wall junctions).
Journal ArticleDOI
Macroscopic Quantum Tunnelling Effects of Bloch Walls in Small Ferromagnetic Particles
Carley Paulsen,Luiz C. Sampaio,Luiz C. Sampaio,Bernard Barbara,R. Tucoulou-Tachoueres,D. Fruchart,A. Marchand,J.L. Tholence,M. Uehara +8 more
TL;DR: In this paper, the magnetic relaxation of a set of small ferromagnetic particles of Tb0.5Ce 0.5Fe2 of mean diameter 150 A has been measured at low temperature (down to 50 mK) and with a field up to 8 Tesla.
Journal ArticleDOI
Mesoscopic quantum tunneling in small ferromagnetic particles
TL;DR: In this paper, the magnetic relaxation of a set of ferromagnetic small particles of Tb 0.5 Ce0.5 Fe 2 of mean diameter 150 A has been measured at low temperatures (down to 50 mK) and with a field up to 6 kOe.
Journal ArticleDOI
Quantum tunnelling in magnetic particles, layers and multilayers
Bernard Barbara,J. E. Wegrowe,Luiz C. Sampaio,J P Nozières,M. Uehara,Miguel A. Novak,Carley Paulsen,J.L. Tholence +7 more
TL;DR: In this paper, an analogy with Josephson junction was made for the case of the sandwiches (domain wall junction) and the role of dissipation was discussed, in terms of a crossover between a thermal regime, in which the irreversible rotation of the magnetization is thermally activated, and a quantum regime in which it proceeds by quantum tunnelling.
Journal ArticleDOI
Mesoscopic quantum tunneling in small ferromagnetic particles
Carley Paulsen,Luiz C. Sampaio,R. Tucoulou Tachouères,Bernard Barbara,D. Fruchart,A. Marchand,J.L. Tholence,M. Uehara +7 more
TL;DR: In this article, the magnetic relaxation of a set of small ferromagnetic particles of Tb 0.5 Ce0.5 Fe 2 of mean diameter 150 A has been measured at low temperatures (down to 50 mK) and with a field up to 6 kOe.