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Vortex-like state observed in ferromagnetic contacts
(B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin ave., 61103, Kharkiv, Ukraine)
(B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin ave., 61103, Kharkiv, Ukraine)
(B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin ave., 61103, Kharkiv, Ukraine)
(B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin ave., 61103, Kharkiv, Ukraine)
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2010 (English)In: Journal of Physics: Conference Series, ISSN 1742-6588, Vol. 200, no 5, 1-4 p.Article in journal (Refereed) Published
Abstract [en]

Point-contacts (PC) offer a simple way to create high current densities, 109 A/cm 2and  beyond,  without  substantial  Joule  heating.   We  have  shown  recently  (Nano  Letters,  7(2007) 927) that conductivity of nanosized PCs between a normal and ferromagnetic metalsexhibits bi-stable hysteretic states versus both bias current and external magnetic field – theeffect typical for spin-valve structures.  Here we report that apart from the bi-stable state athird intermediate-resistance state is occasionally observed.  We interpret this state as due toa spin-vortex in the PC, nucleated either by Oersted field of the bias current and/or by thecircular geometry of PC. The observed three-level-states in the PC conductivity testify that theinterface spins are both weakly coupled to the spins in the bulk and have depressed exchangeinteraction within the surface layer.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2010. Vol. 200, no 5, 1-4 p.
Keyword [en]
vortex, spin valve, point contact, micromagnetism, spin, magnetic
National Category
Nano Technology Condensed Matter Physics Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-49331DOI: 10.1088/1742-6596/200/5/052033ISI: 000291321302077Scopus ID: 2-s2.0-77957058180OAI: oai:DiVA.org:kth-49331DiVA: diva2:461355
Note
QC 20111212Available from: 2011-12-12 Created: 2011-11-25 Last updated: 2011-12-12Bibliographically approved

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Konovalenko, AlexanderKorenivski, Vladislav

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