Method for changing magnetism of ferromagnet CrO2 film using laser induction effect

A laser-induced, ferromagnetic technology, applied in the direction of magnetic layer, static memory, instrument, etc., can solve the problem that the field of optoelectronics cannot be further applied, and the light-induced magnetic effect is not caused.

Inactive Publication Date: 2007-03-14
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its light-induced magnetic effect has not attracted people's at

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  • Method for changing magnetism of ferromagnet CrO2 film using laser induction effect
  • Method for changing magnetism of ferromagnet CrO2 film using laser induction effect

Examples

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Embodiment 1

[0018] This embodiment is: the rutile-type semi-metallic ferromagnetic material CrO prepared by using pulsed laser irradiation with a photon energy of 3.2eV at room temperature 2 film, where CrO 2 The films were prepared on ZrO by chemical vapor deposition in a two-zone tube furnace. 2On the substrate; a dye laser is used as the pulse excitation source, and its pulse width and repetition frequency are 8ns and 10Hz, respectively;

[0019] Detection of CrO under Pulsed Laser Irradiation by CW Light with Energy of 1.55eV 2 The change of film transmittance, and using the relationship between transmittance and magnetism to obtain CrO under pulsed laser irradiation 2 The magnetic change of the film, as shown in Figure 1(a), the curves shown by triangles and circles represent CrOx 2 The light-induced magnetic change of the film at the temperature of 450K (Tc) as a function of time (%). It can be seen from the figure that CrO 2 The light-induced magnetic change of the film is abo...

Embodiment 2

[0023] Example 2: At room temperature, the prepared CrO is irradiated with a pulsed laser with a photon energy of 3.5eV 2 thin film; in this example, the detection of CrO 2 Thin-film magnetic detection of laser-induced CrO using continuous light with an energy of 1.55 eV 2 The magnetoresistance change of thin film (Tc~390K) and its change with temperature.

Embodiment 3

[0024] Example 3: At room temperature, the prepared CrO was irradiated with a pulsed laser with a photon energy of 2.0eV 2 film; and the external electric field is regulated, and the form of the external electric field in Example 1 is the same.

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Abstract

This invention discloses one method to change iron magnetic CrO2 film by use of laser inductance effect, which comprises the following steps: in room temperature, using photon energy as 2.0eV-3.5eV impulse laser to light iron magnetic film; exerting electrical filed onto CrO2 film to ajust changeable volume of film under laser induction and relative resistance change.

Description

1. Technical field [0001] The present invention relates to a kind of change ferromagnet CrO 2 A method for thin film magnetism, especially a method for changing ferromagnetic CrO by laser-induced effect at room temperature 2 thin-film magnetism. 2. Background technology [0002] The study of light-induced magnetic phase transition is one of the frontier fields that are widely concerned at present. It not only provides a very good stage for the study of the interaction between excited state electrons and local electron spins, lattices, etc., but also has very important application value for the study of light-induced magnetic phase transition, which is very important for promoting high-density optical storage. The development of materials and the development of high-performance molecular electronic devices are of great significance. In 2004, Japan had three major research projects involving this field: the control of light on matter (a project of the Japan Science and Tech...

Claims

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Application Information

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IPC IPC(8): H01F10/14G11C11/14
Inventor 刘晓峻吴雪炜程营吴大健
Owner NANJING UNIV
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