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High magnetic fields were used to deform spherical nanocapsules,self-assembled from bola-amphiphilic sexithiophene molecules. At low fields thedeformation -- measured through linear birefringence -- scales quadraticallywith the capsule radius and with the magnetic field strength. These dataconfirm a long standing theoretical prediction (W. Helfrich, Phys. Lett. {\bf43A}, 409 (1973)), and permits the determination of the bending rigidity of thecapsules as (2.6$\pm$0.8)$\times 10^{-21}$ J. At high fields, an enhancedrigidity is found which cannot be explained within the Helfrich model. Wepropose a complete form of the free energy functional that accounts for thisbehaviour, and allows discussion of the formation and stability of nanocapsulesin solution.Comment: 4 pages, 3 figures, accepted in Phys. Rev. Let

Anharmonic Magnetic Deformation of Self-Assembled Molecular Nanocapsules