Exhibition

28Next-Generation Device

Magnetic Nanowire Memory Aiming at a High-Speed Recording Device
For high-speed recording devices with no moving parts

Outline

To develop the high-speed recording devices of the future, we are researching a magnetic nanowire※1 memory whose operation is based on a new principle. This exhibit introduces the current driving and storage principles of magnetic nanowire technology, where information is recorded in magnetic domains※2, and presents the mode of operation of magnetic nanowire recording devices.

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Features

Operating principles of magnetic nanowire memory
A magnetic nanowire memory is a recording device with a structure comprising a paired recording head and read head for each data track of a hard disk. When a current is applied, the magnetic domains (written data) are moved along a magnetic nanowire . This phenomenon can be used to record data simply by changing the magnetic field orientation of the magnetic head, which means that high-speed recording can be achieved without the need for any moving parts.
Visual observation of current-driven magnetic domains
Conventionally, current driving of magnetic domains in a magnetic nanowire is detected as an electrical signal using read head fixed on the specimen nanowire, but in order to analyze the behavior of magnetic domains in detail, we have made a prototype device that enables us to visually observe these domains by magneto-optical microscopy.

Future plans

We will search for magnetic materials that are suitable for the fast driving of magnetic domains, and we will continue to improve the speed of recording and reading for the magnetic nanowire memory.

  • ※1 Magnetic nanowire: A narrow nanostructure of magnetic materials about 100 nm width
  • ※2 Magnetic domain: A nanoscopic unit region where the magnetic moments are all pointing the same way (up or down directions)
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Magnetic Nanowire Memory Aiming at a High-Speed Recording Device For high-speed recording devices with no moving parts

  • Magnetic Nanowire Memory Aiming at a High-Speed Recording Device
  • Microscopic observation of magnetic domains using magneto-optical Effect
  • Magnetic nanowire memory elements fabricated on silicon wafer