| 摘要 |
A position-addressable combinatorial library of double-perovskite materials is disclosed. The library includes a plurality of multi-region substrates, and formed on the substrate regions are double-perovskite compounds having the formulae (AxA'1-x)2(ByB'1-y)CzC'1-z)O6+/- DOLLAR g8d), wherein A is a 2+ cation, A' is a 3+ or 1+ cation, B and B' are each paramagnetic 3+ cations, C and C' are each paramagnetic 5+ cations, x, y and z are whole or fractional number including zero, and delta represents a small deviation from ideal oxygen stoichiometry. The stoichiometry or structure of one pair of elemental components of the double-perovskite materials varies systematically in a first direction and that of another pair varies systematically in a second direction. Also disclosed are an apparatus and a method of producing such a library, namely the combinatorial molecular beam epitaxy (COMBE), the use of the library in identifying double-perovskite compounds with desired properties, e.g., spin polarization or high Curie temperature, and the fabrication and testing of TMR devices comprised of double-perovskite compounds. |
