Nano Archive

Vortex-like state observed in ferromagnetic contacts

Yanson, I K and Naidyuk, Yu G and Fisun, V V and Balkashin, O P and Triputen, L Yu and Konovalenko, A and Korenivski, V (2010) Vortex-like state observed in ferromagnetic contacts. Journal of Physics: Conference Series, 200 (5). 052033.

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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.

Item Type:Article
ID Code:11264
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:30
Last Modified:02 Nov 2011 00:47

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