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Magnetic recording using circularly polarized femto-second laser pulses is anemerging technology that would allow write speeds much faster than existingfield driven methods. However, the mechanism that drives the magnetizationswitching in ferromagnets is unclear. Recent theories suggest that theinteraction of the light with the magnetized media induces an opto-magneticfield within the media, known as the inverse Faraday effect. Here we show thatan alternative mechanism, driven by thermal excitation over the anisotropyenergy barrier and a difference in the energy absorption depending onpolarization, can create a net magnetization over a series of laser pulses inan ensemble of single domain grains. Only a small difference in the absorptionis required to reach magnetization levels observed experimentally and the modeldoes not preclude the role of the inverse Faraday effect but removes thenecessity that the opto-magnetic field is 10s of Tesla in strength.

All-optical switching in granular ferromagnets caused by magnetic circular dichroism