Martinez Umberto, Pacchioni Gianfranco, Illas Francesc
Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 53, 20125 Milano, Italy.
J Chem Phys. 2009 May 14;130(18):184711. doi: 10.1063/1.3132768.
We report on the unusual behavior of Fe(n) clusters (n < or = 6) supported on ultrathin oxide films. When the film is grown on a Mo(001) support, the cluster magnetic moments exhibit a similar quenching as on the bare MgO(001) surface while on MgO/Fe(001) films the magnetization is enhanced due to a charge transfer from the Fe clusters to the MgO/Fe(001) interface. These results obtained using a spin-polarized density functional approach show the potential of using ultrathin films to tune the properties of supported magnetic particles.
我们报道了负载在超薄氧化膜上的Fe(n)团簇（n≤6）的异常行为。当薄膜生长在Mo(001)载体上时，团簇磁矩表现出与在裸露的MgO(001)表面上类似的淬灭现象，而在MgO/Fe(001)薄膜上，由于电荷从Fe团簇转移到MgO/Fe(001)界面，磁化强度增强。使用自旋极化密度泛函方法获得的这些结果表明了利用超薄薄膜来调节负载磁性颗粒性质的潜力。
