Stable magnetic order and charge induced rotation of magnetization in nano-clusters

Abstract

Efficient control of magnetic anisotropy and the orientation of magnetization are of central importance for the application of nanoparticles in spintronics. Conventionally, magnetization is controlled directly by an external magnetic field or by an electric field via spin-orbit coupling. Here, we demonstrate a different approach to control magnetization in small clusters. We first show that the low magnetic anisotropy of a Co5 cluster can be substantially enhanced by attaching benzene molecules due to the mixing between p states of C and the d states of Co sites. We then show that the direction of magnetization vector of Co5 sandwiched between two benzene molecules rotates by 90° when an electron is added or removed from the system. An experimental set up to realize such effect is also suggested.

Large orbital magnetic moments of small, free cobalt cluster ions Co${_n^+}$ with n ${ \leqslant 9}$

“…The lines are guides to the eye. figure 4, shows that almost all studies predict ground state spin multiplicities for the neutral species which are higher than the ones determined in this work, and also higher than predicted [23,[27][28][29], for the cationic species [13,[29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Contrastingly, for the larger neutral Co 6-9 clusters, the majority [29, 32-38, 40, 41] of the studies predict lower spin multiplicities for the neu tral species than the ones determined here for the cationic ones, and even lower than predicted for cations [23,24,28,29], while only two studies [13,30] predict higher spin multiplicities.…”