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Curie–Weiss law
About: Curie–Weiss law is a research topic. Over the lifetime, 3501 publications have been published within this topic receiving 60002 citations.
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TL;DR: The room-temperature electrical control of the ferromagnetic phase transition in cobalt, one of the most representative transition-metal ferromagnets, is demonstrated at room temperature.
Abstract: Electrical control of magnetic properties is crucial for device applications in the field of spintronics. Although the magnetic coercivity or anisotropy has been successfully controlled electrically in metals as well as in semiconductors, the electrical control of Curie temperature has been realized only in semiconductors at low temperature. Here, we demonstrate the room-temperature electrical control of the ferromagnetic phase transition in cobalt, one of the most representative transition-metal ferromagnets. Solid-state field effect devices consisting of a ultrathin cobalt film covered by a dielectric layer and a gate electrode were fabricated. We prove that the Curie temperature of cobalt can be changed by up to 12 K by applying a gate electric field of about ±2 MV cm(-1). The two-dimensionality of the cobalt film may be relevant to our observations. The demonstrated electric field effect in the ferromagnetic metal at room temperature is a significant step towards realizing future low-power magnetic applications.
405 citations
TL;DR: In this article, the Curie point, lattice constants, sublattice magnetization, spontaneous magnetic moment, susceptibility, and the nonlinear susceptibility have been measured on the compounds RFeO3 with R yttrium or a rare earth.
Abstract: The Curie point, lattice constants, sublattice magnetization, spontaneous magnetic moment, susceptibility, and the nonlinear susceptibility have been measured on the compounds RFeO3 with R yttrium or a rare earth. The main conclusions from these measurements are: (1) The rare‐earth ions contribution to the magnetic properties of these materials at relatively high temperature is mainly through the geometrical effect of ionic radii. (2) The ratio of iron sublattice to the weak ferromagnetic moment shows that the canting angle is temperature independent. (3) Between liquid‐air temperature and the Curie point, the rare‐earth ions behave like a paramagnet in an effective magnetic field of the iron ions. This field is of the order of a few thousand gauss of either sign. (4) From measurements of the spontaneous moment, the susceptibility and the nonlinear dependence of the magnetization on applied fields it appears that the antisymmetric exchange interaction is responsible for the weak ferromagnetism of these ma...
393 citations
TL;DR: Magnetic circular dichroism measurements showed a strong interaction between the sp carriers and localized d spins, indicating that Zn(1-x)Cr(x)Te is a diluted magnetic semiconductor.
Abstract: The magnetic and magneto-optical properties of a Cr-doped II-VI semiconductor ZnTe were investigated. Magnetic circular dichroism measurements showed a strong interaction between the sp carriers and localized d spins, indicating that Zn(1-x)Cr(x)Te is a diluted magnetic semiconductor. The Curie temperature of the film with x=0.20 was estimated to be 300+/-10 K, which is the highest value ever reported for a diluted magnetic semiconductor in which sp-d interactions were confirmed. In spite of its high Curie temperature, Zn(1-x)Cr(x)Te film shows semiconducting electrical transport properties.
390 citations
TL;DR: The spontaneous subdivision of a ferromagnetic body into elementary magnets can be interpreted both qualitatively and quantitatively in the following manner: as discussed by the authors assumes that a moderate-sized single crystal of a Ferromagnetic core consists of a number of elementary magnets, the resultant magnetic moment of which vanishes.
Abstract: According to Weiss's well-known theory, a ferromagnetic body in the absence of an external magnetic field must be spontaneously magnetised in such a way that the direction of magnetisation varies in an irregular manner in different portions of the body. It was originally assumed by Weiss that these portions coincide with the minute crystals of which the body is built up. That this is not so is clear from the fact that spontaneous magnetisation (as revealed by the existence of a Curie temperature) is present also in single crystals. We are thus forced to assume that a moderate-sized single crystal of a ferromagnetic body consists of a number of ‘elementary magnets’ the resultant magnetic moment of which vanishes. This spontaneous subdivision of a ferromagnetic body into elementary magnets can be interpreted both qualitatively and quantitatively in the following manner.
362 citations
TL;DR: In this article, the electronic, magnetic, and structural properties of the binary compound Mn3Ga were investigated and it was found that the material is hard magnetic with an energy product of Hc×Br=52.5kJm−3 and an average saturation magnetization of about 0.25μB∕at at 5K.
Abstract: This work reports about the electronic, magnetic, and structural properties of the binary compound Mn3Ga. The tetragonal DO22 phase of Mn3Ga was successfully synthesized and investigated. It has been found that the material is hard magnetic with an energy product of Hc×Br=52.5kJm−3 and an average saturation magnetization of about 0.25μB∕at. at 5K. The saturation magnetization indicates a ferrimagnetic order with partially compensating moments at the Mn atoms on crystallographically different sites. The Curie temperature is above 730K where the onset of decomposition is observed. The electronic structure calculations indicate a nearly half-metallic ferrimagnetic order with 88% spin polarization at the Fermi energy.
338 citations