Patent ID: 8154957

Claim:
A magneto-optical device (MOD) with an optically induced magnetization, comprising: a substrate of a MgO; a ferrite film deposited on the substrate, the ferrite film having an illuminatable surface for receiving optical illumination, the ferrite film comprising a magnesium-manganese-cobalt (Mg—Mn—Co) ferrite with Mg, Mn, Co, and Fe ions in a composition range of Mg in a range of about 0.72 to about 0.78, Mn in a range of about 0.21 to about 0.19, Co in a range of about 0.04 to about 0.06, and Fe in a range of about 1.95 to about 2.05, and oxygen (O) in a range of about 4.05 to about 3.95 molecular percents; the ferrite film having an optically induced magnetization resulting from a room-temperature illumination of at least a portion of the illuminatable surface thereof with circularly polarized light (CPL) along a direction substantially normal to the illuminatable surface; wherein the optically induced magnetization is a residual inverse Faraday effect magnetization (MIFE); wherein the optically induced magnetization has an indefinitely long relaxation time.