Magnetic domain

About: Magnetic domain is a research topic. Over the lifetime, 21452 publications have been published within this topic receiving 393999 citations. The topic is also known as: magnetic domains.

Production method for magnetic refrigeration working medium material Y2Fe17 at room temperature

Abstract: The invention relates to a preparation method of room temperature cryomagnetic working material Y2Fe17. The method mainly includes the steps as follows: materials are matched according to the stoichiometry of the Y2Fe17 and an alloy ingot is obtained by using an electric arc furnace to melt; a vacuum belt thrower is used to manufacture the alloy ingot into a micro-grain belt or a nano-grain belt; then grinding and ball milling are carried out on the belt; then the powder is arranged in the die cavity of material with high magnetic conductivity for charging magnetism under a magnetic field of 0.5 to 2.0 T; the powder after being charged with magnetism is pressed into a stock and sintered in argon for 1 to 4 hours under a temperature between 700 and 1200 DEG C and pre-processed in the argon for 1 to 4 hours under a temperature between 400 and 800 DEG C to manufacture the room temperature cryomagnetic working material Y2Fe17. The method can improve the magnetic moment density and the magnetic domain density of the room temperature cryomagnetic working material, thereby generating a larger magnetocaloric effect.

Measurement of ferromagnetic phase transformation with Barkhausen type experiments

Abstract: Classical Barkhausen effect measurements are used to determine rapid magnetization changes in small volume elements. Typically, one Barkhausen signal corresponds to a change in the magnetization orientation in the magnetic domain. Similarly, the rapid growth of a ferromagnetic phase from a nonferromagnetic matrix should lead to a Barkhausen type signal, since the signal in a pick up coil \intVdt is a function only of the magnetization change with time. It was possible to follow the growth of ferromagnetic phases in TRIP steel with time resolutions of the order of 10-5sec, with transformation in volumes of 10-9cm3, if the volume transformation rate was of the order of 10-3cm3/sec, or larger.

Ferromagnetic material-based memristor

Abstract: The invention discloses a ferromagnetic material-based memristor. The ferromagnetic material-based memristor has a multilayered thin film structure and comprises a ferromagnetic layer or comprises anMTJ or spin valve structure which consists of a first ferromagnetic layer, a non-magnetic layer and a second ferromagnetic layer; based on an SOT effect or an STT effect, by applying a current to thememristor, the magnetic domain state in the ferromagnetic layer or the first ferromagnetic layer in the MTJ or spin valve structure can be changed, thereby realizing continuous change of the resistance value of the device between a high resistance state and a low resistance state, and further realizing information storage, information calculation, neural network and artificial intelligence. The memristor provided by the invention adopts the ferromagnetic material, and based on the SOT effect or the STT effect, information storage is realized by virtue of magnetic domain state change of the ferromagnetic material, so that relatively high read-write performance and relatively high durability are realized; and meanwhile, the memristor provided by the invention adopts a multilayered thin filmstructure, so that the device dimension is small and quite high degree of integration can be realized.

Method and apparatus for making a magnetically loaded insulated electrical conductor

Abstract: Making an insulated electrical conductor having an insulation layer formed from dielectric carrier with magnetically permeable particles dispersed therein in which the conductor bearing the layer is passed through a magnetic field to cause an increase in magnetization of magnetic domains of the particles towards a single direction.