Riken Corporation

Wataru Koshibae

Masashi Kawasaki

Yoshinori Tokura

Naoto Nagaosa

Yoshio Kaneko

Junichi Iwasaki

Ryutaro Yoshimi

Masataka Mogi

An electronic device is provided, including: a first drive electrode; a second drive electrode that is spaced apart from the first drive electrode; and a topological insulator that contacts both of the first drive electrode and the second drive electrode and has magnetism, wherein the topological insulator includes a first region having a first coercivity and a second region having a second coercivity that is different from the first coercivity. A fabrication method of a topological insulator is also provided, including: preparing a topological insulator having magnetism and a first coercivity; and forming a second region having a second coercivity that is different from the first coercivity by irradiating a partial region of the topological insulator with ions.

Electronic device, topological insulator, fabrication method of topological insulator and memory device

A magnetic element capable of generating and erasing a skyrmion, including a magnet shaped as a thin layer and including a structure surrounded by a nonmagnetic material; a current path provided surrounding an end region including an end portion of the magnet, on one surface of the magnet; and a skyrmion sensor that detects the generation and erasing of the skyrmion. With Wm being width of the magnet and hm being height of the magnet, a size of the magnet, with the skyrmion of a diameter &#x3bb; being generated, is such that 2&#x3bb;&#x3e;Wm&#x3e;&#x3bb;/2 and 2&#x3bb;&#x3e;hm&#x3e;&#x3bb;/2. With W being width of the end region in a direction parallel to the end portion of the magnet and h being height of the end region in a direction perpendicular to the end portion of the magnet, the end region is such that &#x3bb;&#x2265;W&#x3e;&#x3bb;/4 and 2&#x3bb;&#x3e;h&#x3e;&#x3bb;/2.

Magnetic element, skyrmion memory, skyrmion memory-device, solid-state electronic device, data-storage device, data processing and communication device

Provided is a magnetic element capable of generating one skyrmion and erasing the one skyrmion. The magnetic element includes a magnet shaped like a substantially rectangular flat plate, an upstream electrode connected to the magnet in a width Wm direction of the magnet and made of a non-magnetic metal, a downstream electrode connected to the magnet in the width Wm direction to oppose the upstream electrode and made of a non-magnetic metal, and a skyrmion sensor configured to detect the skyrmion. Here, a width Wm of the substantially rectangular magnet is such that 3&#xb7;&#x3bb;&#x3e;Wm&#x2265;&#x3bb;, where &#x3bb; denotes a diameter of the skyrmion, a length Hm of the substantially rectangular magnet is such that 2&#xb7;&#x3bb;&#x3e;Hm&#x2265;&#x3bb;, and the magnet has a notch structure at the edge between the upstream electrode and the downstream electrode.

Magnetic element, skyrmion memory, skyrmion memory device, skyrmion-memory embedded solid-state electronic device, data storage apparatus, data processing and communication apparatus

To provide a magnetic element capable of performing skyrmion transfer, a skyrmion memory to which this magnetic element is applied, and a shift register, for example, a magnetic element capable of performing skyrmion transfer is provided, the magnetic element providing a transverse transfer arrangement in which the skyrmion is transferred substantially perpendicular to a current between an upstream electrode and a downstream electrode, and including a plurality of stable positions in which the skyrmion exists more stably than in other regions of a magnet, and a skyrmion sensor that detects a position of the skyrmion.

A magnetic storage media which has an endurance (durability) characteristics close to an infinite number of writing times of data and a data retention (holding) characteristics close to permanency, and is ultra-high-speed writable and erasable, and a data storage device and an image storage device which apply this magnetic storage media are provided. A magnetic storage media includes a thin layer magnet and a magnetic field generating unit arranged facing a surface of the magnet, and is capable of creating or eliminating a skyrmion by applying heat energy to another surface of the magnet positioned on the opposite side of the surface of the magnet, and a skyrmion memory includes the magnetic storage media.

Magnetic storage media and data storage device

Provided is a skyrmion memory circuit capable of circularly transferring a magnetic element skyrmion, comprising one or more current paths in a magnet having a closed-path pattern that are provided surrounding an end region including an end portion of the magnet in a plane of the magnet with the closed-path pattern, and applying current between an outer terminal connected to an outer circumferential portion of the closed-path pattern and an inner circumference electrode connected to an inner circumferential portion of the closed-path pattern, transferring the skyrmion in a direction substantially perpendicular to the direction of the applied current, and circulating the skyrmion in the magnet with the closed-path pattern.

Growing community of inventors

Saitama, Japan

Wataru Koshibae