Vortex-like state observed in ferromagnetic contacts

Details Vortex-like state observed in ferromagnetic contacts Vortex-like state observed in ferromagnetic contacts

2009-07-12

arxiv.org/abs/0907.2027v2

Journal of Physics: Conference Series 200 (2010) 052033

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pgs., 4 figs. submitted to ICM-09 (July 26-21, Karlsruhe) V2: corrected typos, accepted for publication in J. Phys.: Conf. S

Scientific paper

10.1088/1742-6596/200/5/052033

Point-contacts (PC) offer a simple way to create high current densities, 10^9 A/cm^2 and beyond, without substantial Joule heating. We have shown recently (Nano Letters, 7 (2007) 927) that conductivity of nanosized PCs between a normal and ferromagnetic metals exhibits bi-stable hysteretic states versus both bias current and external magnetic field - the effect typical for spin-valve structures. Here we report that apart from the bi-stable state a third intermediate-resistance state is occasionally observed. We interpret this state as due to a spin-vortex in the PC, nucleated either by Oersted field of the bias current and/or by the circular geometry of PC. The observed three-level-states in the PC conductivity testify that the interface spins are both weakly coupled to the spins in the bulk and have depressed exchange interaction within the surface layer.

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