{"title":"Kondo resonance in magnetic double tunnel junctions","authors":"H. Yang, S. Yang, C. Kaiser, S. Parkin","doi":"10.1109/INTMAG.2005.1463669","DOIUrl":null,"url":null,"abstract":"The magneto-transport properties of double tunnel junctions are reported as a function of temperature and bias. The double tunnel junctions were formed with MgO tunnel barriers and CoFe magnetic electrodes in which the middle electrode is comprised of ultra-thin CoFe layers. Double magnetic tunnel junctions, comprised of CoFe/MgO/CoFe/MgO/CoFe, were deposited on SiO/sub 2/ through a sequence of metal shadow masks using dc magnetron sputtering at room temperature. Tunneling magnetoresistance and AC conductance measurements show a peak in the conductance at low bias voltages and temperatures (below /spl sim/50 K) and a strong suppression of tunneling magnetoresistance in the same bias voltage and temperature regime. These features are strongly reminiscent of Kondo resonance effects previously observed previously in lithographically defined quantum dots and C/sub 60/ molecules placed between ferromagnetic electrodes.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"77 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/INTMAG.2005.1463669","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The magneto-transport properties of double tunnel junctions are reported as a function of temperature and bias. The double tunnel junctions were formed with MgO tunnel barriers and CoFe magnetic electrodes in which the middle electrode is comprised of ultra-thin CoFe layers. Double magnetic tunnel junctions, comprised of CoFe/MgO/CoFe/MgO/CoFe, were deposited on SiO/sub 2/ through a sequence of metal shadow masks using dc magnetron sputtering at room temperature. Tunneling magnetoresistance and AC conductance measurements show a peak in the conductance at low bias voltages and temperatures (below /spl sim/50 K) and a strong suppression of tunneling magnetoresistance in the same bias voltage and temperature regime. These features are strongly reminiscent of Kondo resonance effects previously observed previously in lithographically defined quantum dots and C/sub 60/ molecules placed between ferromagnetic electrodes.
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