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Article overview
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All-optical switching in granular ferromagnets caused by magnetic circular dichroism | | Matthew O. A. Ellis
; Eric E. Fullerton
; Roy W. Chantrell
; | | Date: |
3 May 2016 | | Abstract: | Magnetic recording using circularly polarized femto-second laser pulses is an
emerging technology that would allow write speeds much faster than existing
field driven methods. However, the mechanism that drives the magnetization
switching in ferromagnets is unclear. Recent theories suggest that the
interaction of the light with the magnetized media induces an opto-magnetic
field within the media, known as the inverse Faraday effect. Here we show that
an alternative mechanism, driven by thermal excitation over the anisotropy
energy barrier and a difference in the energy absorption depending on
polarization, can create a net magnetization over a series of laser pulses in
an ensemble of single domain grains. Only a small difference in the absorption
is required to reach magnetization levels observed experimentally and the model
does not preclude the role of the inverse Faraday effect but removes the
necessity that the opto-magnetic field is 10s of Tesla in strength. | | Source: | arXiv, 1605.0835 | | Services: | Forum | Review | PDF | Favorites | |
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