Magnetic structure of photoinduced region in Y3Fe5O12: Si

A case is considered of simultaneous existence of cubic magnetic anisotropy and uniaxial magnetic anisotropy induced in the plane of a sample in ferromagnetic and, particularly, inside a localized photoinduced region (PIR). The energy of the 180 deg domain boundaries (DB) grows and becomes less dependent on the DB inclination to the wafer plane as the induced uniaxial anisotropy grows the the 180 deg DB thickness decreases. The 180 deg DB with the plane perpendicular to the (110) wafer plane are energetically profitable irrespective of the uniaxial anisotropy value. The PIR boundary outline represents a broken line not corresponding to the cross section configuration of a light beam and comprising sections of 70 deg and 110 deg DB. The experimentally observed large PIR boundary width is explained by increasing inclination of these DB from the wafer plane