Exchange coupling and magnetoresistance in CoFe/NiCu/CoFe spin valves near the Curie point of the spacer
2010 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 107, no 9, 09D711- p.Article in journal (Refereed) Published
Thermal control of exchange coupling between two strongly ferromagnetic layers through a weakly ferromagnetic Ni-Cu spacer and the associated magnetoresistance is investigated. The spacer, having a Curie point slightly above room temperature, can be cycled between its paramagnetic and ferromagnetic states by varying the temperature externally or using joule heating. It is shown that the giant magnetoresistance vanishes due to a strong reduction in the mean free path in the spacer at above similar to 30% Ni concentration-before the onset of ferromagnetism. Finally, a device is proposed which combines thermally controlled exchange coupling and large magnetoresistance by separating the switching and the readout elements.
Place, publisher, year, edition, pages
2010. Vol. 107, no 9, 09D711- p.
NI-CU ALLOYS, ELECTRICAL-RESISTIVITY, MAGNETIC MULTILAYERS, MOMENTS, MEMORY, NICKEL, LAYERS
IdentifiersURN: urn:nbn:se:kth:diva-29840DOI: 10.1063/1.3340509ISI: 000277834300288ScopusID: 2-s2.0-77951697796OAI: oai:DiVA.org:kth-29840DiVA: diva2:399826
QC 20110222 11th Joint MMM-Intermag Conference, Washington, DC, JAN 18-22, 20102011-02-232011-02-172012-03-13Bibliographically approved