Mechanical magnetometry of Cobalt nanospheres deposited by focused electron beam at the tip of ultra-soft cantilevers

Hugo Lavenant (1) , Vladimir V. Naletov (1) , Olivier Klein (1) , G. de Loubens (1) , Casado Laura (2) , Jose Maria de Teresa (2)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 University of Zaragoza - Universidad de Zaragoza [Zaragoza]

Using focused-electron-beam-induced deposition, Cobalt magnetic nanospheres with diameter ranging between 100 nm and 300 nm are grown at the tip of ultra-soft cantilevers. By monitoring the mechanical resonance frequency of the cantilever as a function of the applied magnetic field, the hysteresis curve of these individual nanospheres are measured. This enables to evaluate their saturation magnetization, found to be around 430 emu/cm^3 independently of the size of the particle, and to infer that the magnetic vortex state is the equilibrium configuration of these nanospheres at remanence.

Mots clés: Focused-electron-beam-induced deposition; Cobalt; nanomagnet; magnetic nanosphere; magnetic vortex; magnetometry; cantilever; mechanical detection

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Hugo Lavenant, Vladimir V. Naletov, Olivier Klein, G. de Loubens, Casado Laura, et al.. Mechanical magnetometry of Cobalt nanospheres deposited by focused electron beam at the tip of ultra-soft cantilevers. 2014. ⟨hal-00969081⟩