Abstract
Magnetic and electric properties of epitaxially grown YBa2Cu3O7−x(YBCO)/La0.7Sr0.3MnO3(LSMO) and LSMO/YBCO structures prepared by off-axis and faced-target magnetron sputtering deposition on SrTiO3 [100] substrates without intermediate buffer are investigated. The possibility is demonstrated to fabricate soft (with low coercive force Hc=25Oe) films, independent of the temperature used, and ‘tuned-soft’ (with coercive force Hc up to 200Oe), the latter being achieved by heating substrate non-uniformly during deposition. A novel technique is realised for substrate heating during deposition, whereby the substrate is separated from the heater by thin (0.2mm in diameter) quartz fibres, which allow several deposition cycles for one sample in different vacuum installations. At 77K the superconducting film has Tc∼86K and Jc∼0.7×106A/cm2 as a bottom layer, and Tc∼88K and Jc∼1.7×106A/cm2 as a top layer (the optimal stand-alone YBCO films have Tc∼90K and Jc∼(2.5–5)×106A/cm2 at 77K). The magnetic measurements of the in-plane magnetic moment by SQUID magnetometer gave M=0.6–1.2Am2 at H=200Oe. The results demonstrate the possibility of depositing double-layer combinations of YBCO/LSMO films with reproducible high crystalline quality, without an intermediate buffer for spintronics applications.
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