Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-12-19
Science 290, 1546 (2000)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 3 figures
Scientific paper
10.1126/science.290.5496.1546
We report a new manifestation of first-order magnetic transitions in two-dimensional electron systems. This phenomenon occurs in aluminum arsenide quantum wells with sufficiently low carrier densities and appears as a set of hysteretic spikes in the resistance of a sample placed in crossed parallel and perpendicular magnetic fields, each spike occurring at the transition between states with different partial magnetizations. Our experiments thus indicate that the presence of magnetic domains at the transition starkly increases dissipation, an effect also suspected in other ferromagnetic materials. Analysis of the positions of the transition spikes allows us to deduce the change in exchange-correlation energy across the magnetic transition, which in turn will help improve our understanding of metallic ferromagnetism.
de Poortere E. P.
Papadakis Stergios J.
Shayegan Mansour
Tutuc Emanuel
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