Magneto-optical switching device and method for switching a magnetizable medium

A technology for converting media and converting devices, applied in recording/reproducing/deleting methods, magnetic recording, beam reproduction, etc., capable of solving problems such as high power consumption, high manufacturing cost of magnetic devices, and failure to simplify the magnetic recording process

Active Publication Date: 2009-09-09
STICHTING KATHOLIEKE UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this solution does not simplify the magnetic recording process, but instead requires more components, resulting in high manufacturing cost of the magnetic device and higher power consumption.
In addition, I.Tudosa et al. in Nature 428, 831 (2004) and C.H.Back et al. in Nature 428, 808 (2004) have confirmed that the limiting speed of magnetic switching induced by a magnetic field is limited to the time scale of picoseconds middle

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  • Magneto-optical switching device and method for switching a magnetizable medium
  • Magneto-optical switching device and method for switching a magnetizable medium
  • Magneto-optical switching device and method for switching a magnetizable medium

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Embodiment Construction

[0014] The interaction of light with magnetized media has been demonstrated in various magneto-optical phenomena. A good example is the Faraday effect, observed as a rotation of the plane of polarization of light passing through a magnetic medium:

[0015] α F = x n M · k [equation 1]

[0016] Among them, α F is the specific Faraday rotation, M is magnetism, n is the refractive index, k is the wave vector of light, and x is the magneto-optical susceptibility, which is a scalar in isotropic media value. Various devices such as magneto-optical insulators and modulators use large values ​​of the Faraday rotation angle in light-transmitting magnetic compounds.

[0017] Less well known is the inverse Faraday effect, in which high-intensity laser radiation acts as a magnetic field on the medium and induces a static magnetism M(0):

[0018] M ...

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Abstract

The invention relates to a magneto-optical switching device for switching magnetization in a medium, comprising a magnetizable medium. According to the invention, a radiation system suited for imparting angular momentum to the magnetic spin system of said magnetizable medium, so as to selectively orient the magnetization of said medium. In addition, the invention relates to a method of switching a magnetizable medium, comprising providing a magnetizable medium; providing a radiation beam of a selectively chosen angular momentum; and targeting said radiation beam to said medium so as to transfer said angular momentum to a magnetic spin system of said magnetizable medium. Accordingly, spin states in magnetic materials can be manipulated using radiation of a suitable angular momentum. An effective magnetic field is generated for orienting the magnetization of the domains and can simultaneously be used to locally heat the material.

Description

technical field [0001] The present invention relates to a magneto-optical conversion device for converting magnetism in a medium, in particular, for information recording purposes. In addition, the invention also relates to a method for switching a magnetizable medium. Background technique [0002] In magnetic and magneto-optical conversion devices, especially for recording purposes, information bits are stored as oppositely oriented magnetic domains representing the values ​​"0" and "1", respectively. A conventional method of switching spins or magnetic domains is to provide an external magnetic field along the direction of the spins opposite to their initial orientation. This is a rather slow reversal process. Alternatively, the external magnetic field can be provided perpendicular to the spin orientation rather than parallel to it. This will cause a much faster reversal process by precessional motion of the spins around an externally provided magnetic field. Various m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B11/10G11B11/105
CPCG11B11/10584G11C13/06G11C19/0808G11B11/10539G11B11/10591G11B11/10506G11B2005/0002G11B5/02G11B11/105G11B11/10
Inventor 特奥多鲁斯·亨利克斯·玛丽亚·拉辛安德烈·伊万诺夫伊奇·基里利乌阿列克埃·沃尔德马罗维特斯杰·基梅尔克劳迪乌·丹尼尔·斯坦丘弗雷德里克·汉斯廷伊藤彰义塚本新
Owner STICHTING KATHOLIEKE UNIV
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