Fabrication of MgB<sub>2</sub> Thin Films Using Nd:YAG-PLD Method in an <i>in-situ</i> Post-annealing Process

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  • Nd:YAG-PLD 法による <i>in-situ</i> ポストアニールプロセスを用いた MgB<sub>2</sub> 薄膜の作製

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<p>Magnesium diboride (MgB2) is a promising candidate for superconducting diodes due to its high lower critical field (Hc1). In this study, we fabricate MgB2 thin films by a precursor and in-situ post-annealing process as a candidate material for superconducting diodes. The precursor is obtained by pulsed laser deposition (PLD) method using a Nd:YAG laser. The MgB2 thin films prepared by a high-density Mg-rich target with a ratio of Mg : MgB2 = 2 : 1 show the highest superconducting transition at Tconset = 33.6 K and Tczero = 31.7 K. The critical current density Jc(0 T) calculated from magnetization measurements reaches 0.9×106 A/cm2 at 20 K. The X-ray diffraction patterns indicate that the MgB2 phase would be oriented with c-axis perpendicular to the substrate surface and/or would have an extremely fine grain size. These results demonstrate that the precursor and in-situ post-annealing process by Nd:YAG-PLD method is favorable for fabricating superconducting diodes with MgB2 material.</p>

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