Magneto-transport and exchange biasing in La-Ca-Mn-O compositionally modulated ferromagnetic/antiferromagnetic multilayers
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Panagiotopoulos, I.
Christides, C.
Niarchos, D.
Pissas, M.
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American Institute of Physics
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peer reviewed
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Journal of Applied Physics
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Compositionally modulated structures consisting of La2/3Ca1/3MnO3 ferromagnetic (FM) layers and La1/3Ca2/3MnO3 antiferromagnetic (AF) layers, with layer thickness 1.5 nm less than or equal to t(FM),t(AF)less than or equal to 6 nm, were grown on (100)LaAlO3 by pulsed laser deposition. Thermomagnetic and isothermal magnetic measurements reveal an exchange-biasing mechanism with the same blocking temperature T(B)approximate to 70 K for all the examined combinations of t(FM) and t(AF). The ratio of colossal magnetoresistance increases in multilayers with larger t(FM), whereas the exchange-biasing field increases in samples with larger t(AF). The independence of T-B on t(FM) and t(AF) shows that the artificially induced La1-xCaxMnO3 (x approximate to 0.5) compositional modulation at the interfaces is of critical importance for exchange biasing in La-Ca-Mn-O based multilayers. (C) 2000 American Institute of Physics. [S0021-8979(00)01708-4].
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unidirectional anisotropy, films, magnetoresistance, superlattices, oxide, magnetotransport, la1-xcaxmno3, perovskites, bilayers, fe
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<Go to ISI>://000086169500048
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en
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Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών