Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Surface Magnetism 2 (Joint Session with O)
MA 49.5: Talk
Thursday, March 23, 2017, 10:30–10:45, HSZ 401
Interplay of magnetic coupling and anisotropy of Ho3N@C80 endohedral fullerenes on ferromagnetic substrates — •Matthias Bernien1, Fabian Nickel1, Jorge Miguel1, Lucas M. Arruda1, Lalminthang Kipgen1, Norman Blümel1, Dennis Krüger1, Andrew J. Britton1, Enrico Schierle2, Eugen Weschke2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin
Magnetic endohedral fullerenes are promising candidates for a future molecular spintronics provided one can gain external control over their encapsulated magnetic moments. In Ho3N@C80 three Ho ions are coupled together with a non-collinear alignment of their magnetic moments. Each of the Ho3+ ions has a magnetic moment of 10 µB and strong magnetic anisotropy. We use field- and angle-dependent X-ray absorption and X-ray magnetic circular dichroism measurements at a temperature of T=4.5 K and an applied magnetic field up to B=6 T to investigate the magnetic properties of submonolayers of Ho3N@C80 adsorbed on ferromagnetic Ni and Co films. We find that the net moment of Ho3N@C80 couples ferromagnetically to Ni but antiferromagnetically to Co substrates. Both of these couplings to the substrate can be explained by an indirect exchange mechanism mediated by the carbon cage.
Financial support by the DFG (Sfb 658) is gratefully acknowledged.