Current Driven tri-stable Resistance States in Magnetic Point Contacts

Details Current Driven tri-stable Resistance States in Magnetic Point Contacts Current Driven tri-stable Resistance States in Magnetic Point Contacts

2009-07-19

arxiv.org/abs/0907.3286v1

J. Phys.: Condens. Matter 21 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 Figs. accepted for publ. in J. Phys.: Cond. Mat., for additional exp. data see also: arXiv:0907.2027

Scientific paper

10.1088/0953-8984/21/35/355004

Point contacts between normal and ferromagnetic metals are investigated using magneto-resistance and transport spectroscopy measurements combined with micromagnetic simulations. Pronounced hysteresis in the point-contact resistance versus both bias current and external magnetic field are observed. It is found that such hysteretic resistance can exhibit, in addition to bi-stable resistance states found in ordinary spin valves, tri-stable resistance states with a middle resistance level. We interpret these observation in terms of surface spin-valve and spin-vortex states, originating from a substantially modified spin structure at the ferromagnetic interface in contact core. We argue that these surface spin states, subject to a weakened exchange interaction, dominate the effects of spin transfer torques on the nanometer scale.

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