Provided is a method for producing a magnetic material. The method includes preparing magnetic metal particles containing at least one magnetic metal selected from a first group consisting of Fe, Co and Ni, and at least one non-magnetic metal selected from a second group consisting of Mg, Al, Si, Ca, Zr, Ti, Hf, Zn, Mn, Ba, Sr, Cr, Mo, Ag, Ga, Sc, V, Y, Nb, Pb, Cu, In, Sn and rare earth elements, pulverizing and reaggregating the magnetic metal particles, and thereby forming composite particles containing a magnetic metal phase and an interstitial phase, and heat-treating the composite particles at a temperature of from 50 C. to 800 C. The particle size distribution of the magnetic metal particles in the preparing magnetic metal particles has two or more peaks.

A magnetic device includes a fixed layer including a fixed pattern, a free layer, and a tunnel barrier between the fixed layer and the free layer. The fixed pattern includes a first magnetic pattern, a second magnetic pattern, and a hybrid spacer, including a nonmagnetic material layer, between the first magnetic pattern and the second magnetic pattern, the nonmagnetic material including a plurality of magnetic nanoparticles dispersed therein.

The metal magnetic powder includes Co as a main component, and an average particle size (D50) of 1 nm to 100 nm. An X-ray diffraction chart of the metal magnetic powder has a first peak that appears in a range of a diffraction angle 2? of 41.6?0.3?, and a second peak that appears in a range of a diffraction angle 20? of 47.4?0.3?. When a full width at half maximum of the first peak is set as FW1, and a full width at half maximum of the second peak is set as FW2, a ratio (FW2/FW1) of FW2 to FW1 is 1 to 5.

An object of the present invention is to provide a magneto-optical material capable of exhibiting the Faraday effect even though no magnetic field is applied. The magneto-optical material of the present invention has a nanogranular structure in which magnetic nanoparticles are dispersed in a fluoride matrix, and can exhibit Faraday properties without requiring the application of a magnetic field because the magnetic nanoparticles are configured by a magnetic material that has residual magnetization and consists of any of a FePt alloy, a CoPt alloy, a FeCoNiAl alloy, a Co ferrite, or a Ba ferrite.

A metal magnetic powder includes: metal nanoparticles having an average particle size (D50) is 1 nm to 100 nm, and a main phase of hcp-Co; and an additive elements ? including at least one of Fe, Ni, and Cu.

There is provided a microparticle comprising magnetic nanoparticles within a matrix such as a polymer sphere, wherein the magnetic nanoparticles have an anisotropy constant K in the range 1.0 to 3.0?10.sup.5 ergs cm.sup.?3 and exhibit a hysteresis loop under an alternating magnetic field so as to generate hysteresis heating whilst fixed within the polymer sphere. The alternating magnetic field has a maximum field strength in the range 100 to 400 Oe and a frequency in the range 25 kHz to 500 kHz. The magnetic nanoparticles have an axial ratio of at least 1.1 and are preferably magnetite and substantially crystalline. A method of synthesising such magnetic nanoparticles is also provided.

A magnetic material that includes: particles of a layered material including one or more layers and magnetic metal ions in contact with the one or more layers, wherein the one or more layers include a layer body represented by: M.sub.mX.sub.n, wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is not less than 1 and not more than 4, and m is more than n but not more than 5, and a modifier or terminal T is present on a surface of the layer body, wherein T is at least one selected from a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom, and wherein the particles have an average value of thickness of not less than 1 nm and not more than 10 nm.

Embodiments of the present disclosure provide for polymer conjugates, methods of making the polymer conjugates, methods of using polymer conjugates, and the like, where the polymer conjugates include magnetic particles (e.g. iron oxide particles). Embodiments of the present disclosure can be advantageous for one or more of the following reasons: strong and rapid magnetic response, multiple types of agents can be attached to the polymer conjugate, the size of the polymer conjugate can be controlled, and the polymer conjugates can be produced in a cost-effective manner.

An object of the present invention is to provide ferrite particles having high saturation magnetisation and electrical resistivity, excellent in dispersibility in a resin, a solvent, or a resin composition; a rein composition containing the ferrite particles; and a resin molding composed of the resin composition. A Ni-Zn-Cu ferrite particle is in a single crystalline body having an average particle diameter of 1 to 2000 nm, has a polyhedral particle shape, and comprises 5 to 10 wt % of Ni, 15 to 30 wt % of Zn, 1 to 5 wt % of Cu, and 25 to 50 wt % of Fe.

Provided herein are encoded microcarriers for analyte detection in multiplex assays. The microcarriers are encoded with an analog code for identification and comprise a capture agent for analyte detection and a substantially transparent magnetic polymer. The analog code is generated by a two-dimensional shape of a substantially non-transparent layer. Also provided are methods of making the encoded microcarriers disclosed herein. Further provided are methods and kits for conducting a multiplex assay using the microcarriers described herein.