<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>π</mml:mi></mml:math>-anisotropy: A nanocarbon route to hard magnetism
Timothy Moorsom, Shoug M. Alghamdi, Sean Stansill, Emiliano Poli, Gilberto Teobaldi, Marijan Beg, Hans Fangohr, Matthew Rogers, Zabeada Aslam, M. Ali, B. J. Hickey, Oscar Céspedes
Abstract
Hybridization and charge transfer at molecule-metal interfaces can alter the magnetic anisotropy of transition metal ferromagnets. Here, the authors show that the molecule C${}_{60}$ increases the magnetic energy product of cobalt thin films by 520 % at low temperature. The authors outline a mechanism for this effect, dubbed $\ensuremath{\pi}$-anisotropy, which explains magnetic hardening as a consequence of $p$-$d$ hybridization and broken interfacial symmetry. It is anticipated that this may provide a route towards a rare earth free high-coercivity magnet.
Topics & Concepts
AnisotropyMagnetismCoercivityFerromagnetismCondensed matter physicsMaterials scienceMagnetic anisotropyCrystallographyPhysicsChemistryMagnetizationMagnetic fieldQuantum mechanicsMagnetism in coordination complexesMagnetic properties of thin filmsAdvanced Condensed Matter Physics