Shifted loops due to imprinted barriers at high fields

Shifted loops and coercivity from field-imprinted high-energy barriers in ferritin and ferrihydrite nanoparticles.
Nuno J. O. Silva, V. S. Amaral, A. Urtizberea, R. Bustamante, A. Millán, F. Palacio, E. Kampert, U. Zeitler, S. de Brion, Òscar Iglesias and A. Labarta.
Phys. Rev. B 84, 104427 (2011)

Dependence of the (a) coercive field HC and (b) loop shift HS on the maximum field Hmax in ferritin, for different cooling fields Hcool.