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Torque magnetometry was used to investigate the magnetic anisotropy of epitaxial Fe 3 O 4 films of thicknesses 420 and 40nm grown by pulsed laser deposition on (001) MgO substrates. Torque measurements at 130K in the (1 1 ̄0) plane allow us to evaluate the influence of shape and stress anisotropy. As in bulk material field-cooled measurements performed at T=5K show that the magnetic...