Ultrafast photomagnetic recording in a dielectric medium using anisotropic ions effective gilber damping
AssigneeUniwersytet W Bialymstoku
InventorsAndrzej Stupakiewicz, Krzysztof Szerenos
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Abstract
A recording medium comprising a dielectric magnetic layer, the dielectric magnetic layer comprising anisotropic ions having a difference in a single ion contribution to magnetic anisotropy (ΔK/ion) between a ground state and an excited state of said anisotropic ions equal to at least 0.1 cm−1 (0.0124 meV/ion) at 20° C. (68° F.), wherein the effective Gilbert damping (α) of said dielectric magnetic layer is equal to at least 0.01.
Claims17
A recording medium comprising at least one dielectric magnetic recording layer, the dielectric magnetic recording layer comprising anisotropic ions having a difference in a single ion contribution to magnetic anisotropy (ΔK/ion) between a ground state and an excited state of said anisotropic ions equal to at least 0.1 cm−1 (0.0124 meV/ion) at 20° C. (68° F.), wherein the effective Gilbert damping (α) of said dielectric magnetic recording layer is equal to at least 0.01.
A method for ultrafast photomagnetic recording comprising:
- providing a recording medium comprising at least one dielectric magnetic recording layer, the dielectric magnetic recording layer comprising anisotropic ions having a difference in a single ion contribution to magnetic anisotropy (ΔK/ion) between a ground state and an excited state of said anisotropic ions equal to at least 0.1 cm−1 (0.0124 meV/ion) at 20° C. (68° F.), wherein the effective Gilbert damping (α) of said dielectric magnetic recording layer is equal to at least 0.01;
- illuminating said dielectric magnetic recording layer by a light pulses that have a pulse duration equal to not more than 100 ps;
- tuning a wavelength and a polarization of the light pulses to cause optical resonances excitation of said anisotropic ions, thereby inducing transitions to the excited states of said anisotropic ions of said dielectric magnetic recording layer.
A system for ultrafast photomagnetic recording comprising:
- a recording medium comprising a dielectric magnetic recording layer, the dielectric magnetic recording layer comprising anisotropic ions having a difference in a single ion contribution to magnetic anisotropy (ΔK/ion) between a ground state and an excited state of said anisotropic ions equal to at least 0.1 cm−1 (0.0124 meV/ion) at 20° C. (68° F.), wherein the effective Gilbert damping (α) of said dielectric magnetic recording layer is equal to at least 0.01;
- a light source for emitting light pulses that have a pulse duration equal to not more than 100 ps;
- a polarizer for polarizing light output from said light source;
- a light guide for directing the polarized light to the recording medium to cause optical resonances excitation of said anisotropic ions, thereby inducing transitions to the excited states of said anisotropic ions of said dielectric magnetic recording layer.
Dependencies are inferred from the claim text.