Magnetism and deformation of epitaxial Pd and Rh thin films

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Authors

KÁŇA Tomáš HÜGER Erwin LEGUT Dominik ČÁK Miroslav ŠOB Mojmír

Year of publication 2016
Type Article in Periodical
Magazine / Source Physical Review B
MU Faculty or unit

Central European Institute of Technology

Citation
web http://journals.aps.org/prb/pdf/10.1103/PhysRevB.93.134422
Doi http://dx.doi.org/10.1103/PhysRevB.93.134422
Field Solid matter physics and magnetism
Keywords CLOSE-PACKED PD; ELECTRONIC-STRUCTURE; PALLADIUM CLUSTERS; TETRAGONAL STATES; BAND-STRUCTURE; TOTAL-ENERGY; GROWTH; FERROMAGNETISM; SURFACE; RHODIUM
Description By means of ab initio calculations, we investigated structural and magnetic properties of Pd and Rh thin films, determining their lattice parameters and epitaxial stresses when they are grown on various substrates, and provided a comparison with available experimental data. Further, we studied in detail the magnetic properties of Pd in the higher-energy hcp structure and of Rh in the higher-energy bcc structure. The results predict that the hcp(11 (2) over bar0) Pd films [grown by epitaxy on the Nb(001) substrate] should not be ferromagnetically ordered. Concerning the hcp Pd, we mainly investigated the influence of the hcp c/a ratio on the hcp film stability and on the ferromagnetic order. It turns out that the c/a ratio has to be below 1.622 to induce the ferromagnetic order in hcp Pd. We proposed a technological route for obtaining ferromagnetic hcp(11 (2) over bar0) Pd films and explained the experimentally observed ferromagnetism in twinned Pd nanoparticles induced by strain. We also found that bcc Rh is ferromagnetically ordered, but it cannot be stabilized in the form of thin films. Therefore, we investigated the dependence of ferromagnetic order in bct Rh on the tetragonal c/a ratio and compared our results with experiments performed on Rh/Fe(001) multilayers.
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