Magnetic storage media and data storage device

A magnetic storage media, comprising:

• a thin layer magnet and
• a magnetic field generating unit that is arranged facing a surface of the magnet and generates a magnetic field corresponding to a skyrmion crystal phase of the magnet, the magnetic field setting the magnet in a metastable ferromagnetic state, wherein
• a skyrmion can be created or eliminated by applying heat energy to another surface of the magnet, the other surface positioned on an opposite side of the surface of the magnet,
• with respect to a diameter λ of the skyrmion created in the thin layer magnet, a plane size of the thin layer magnet has a size of Wm>λ/2 and hm>λ/2, where Wm indicates a width of the plane and hm indicates a height of the plane, and
• the skyrmion is eliminated in the magnet by locally applying the heat energy to the other surface of the magnet that is in the metastable ferromagnetic state for an application time satisfying 200 (1/J)≧t≧150 (1/J) when heat energy kBT in the magnet is 2.0J>kBT1.5J and for the application time satisfying 250 (1/J)≧t≧200 (1/J) when kBT 2.0J, where J indicates a dimension of a magnetic exchange interaction of the magnet, kB indicates a Boltzmann constant, and T indicates a temperature of the magnet in a position to which the heat energy is applied.

A skyrmion memory, comprising:

• a magnetic storage media, including
• a thin layer magnet, and
• a magnetic field generating unit arranged facing a surface of the magnet, wherein
• a skyrmion can be created or eliminated by applying heat energy to another surface of the magnet, the other surface positioned on an opposite side of the surface of the magnet;
• a first electrode having an insulator arranged in contact with an upper portion of the other surface of the magnet and a magnetic metal arranged in contact with an upper portion of the insulator;
• and
• a second electrode including a metal arranged in contact with a lower portion of the surface, wherein
• a voltage is applied to the first electrode and the second electrode,
• Joule heat generated by causing a current to flow through the insulator is applied to the magnet,
• a skyrmion is created or eliminated in the magnet, and
• a skyrmion is detected by a tunnel current flowing through the insulator.