Magnetic-field-induced anisotropic curvature elasticity of a vesicle membrane containing magnetic polyions - art. no. 041512

Interaction between a charged membrane and the electrolyte solution contain ing magnetic polyions is considered. A self-magnetic field, which arises du e to the nonhomogeneous magnetic particle distribution near a charged membr ane increases the effective charge screening length for the parts of a memb rane normal to a magnetic field. The anisotropy of elastic properties of a membrane depending on the screening length is calculated on the basis of th e curvature expansion. It is shown that due to diminishing of the spontaneo us curvature for the parts of a membrane normal to a magnetic field there a re two competing mechanisms of the ferrovesicle shape transformation under the influence of a magnetic held-the formation of a prolate shape orientate d along a field due to the diminishing action of the demagnetizing field en ergy and the deformation to a oblate shape due to the decrease in the spont aneous curvature of the parts of a membrane normal to a field.