Title :
Colossal magnetoresistance in La-Y-Ca-Mn-O films
Author :
Chen, L.H. ; Tiefel, T. T H ; Jin, S. ; Palstra, T.T.M. ; Ramesh, R. ; Kwon, C.
Author_Institution :
Kaohsiung Polytech. Inst., Taiwan
fDate :
9/1/1996 12:00:00 AM
Abstract :
Magnetoresistance behavior of La0.60Y0.07CaMnOx thin films epitaxially grown on LaAlO3 has been investigated. The films exhibit colossal magnetoresistance with the MR ratio in excess of 108% at -60 K, H=7T, which is the highest ever reported for thin film manganites. The partial substitution of La3+ ions with much smaller Y3+ ions results in mote than an order of magnitude improvement in MR as compared to the undoped La-Ca-Mn-O material, both in bulk and thin film form. The La-Y-Ca-Mn-O films exhibit a strong dependence of magneto-resistance on film thickness with the maximum MR occuring at a film thickness of -1000
Keywords :
calcium compounds; epitaxial layers; giant magnetoresistance; lanthanum compounds; yttrium compounds; 60 K; La-Y-Ca-Mn-O films; La0.60Y0.07CaMnO; La0.60Y0.07CaMnOx; LaAlO3; colossal magnetoresistance; partial substitution; thin film manganites; Atmosphere; Colossal magnetoresistance; Conductivity; Lattices; Magnetic films; Magnetic materials; Substrates; Superconducting films; Superconducting magnets; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
