Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-08-02
Phys.Rev.Lett.105:207204,2010
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Final version accepted by Physical Review Letters
Scientific paper
10.1103/PhysRevLett.105.207204
The observation of isolated positive and negative charges, but not isolated magnetic north and south poles, is an old puzzle. Instead, evidence of effective magnetic monopoles has been found in the abstract momentum space. Apart from Hall-related effects, few observable consequences of these abstract monopoles are known. Here, we show that it is possible to manipulate the monopoles by external magnetic fields and probe them by universal conductance fluctuation (UCF) measurements in ferromagnets with strong spin-orbit coupling. The observed fluctuations are not noise, but reproducible quasiperiodic oscillations as a function of magnetisation direction, a novel Berry phase fingerprint of the magnetic monopoles.
Brataas Arne
Hals Kjetil M. D.
Nguyen Anh Kiet
Waintal Xavier
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