A method for fabricating polymeric sheets containing microwires includes encapsulating at least a portion of individual lengths of a plurality of microwires in a non-conductive polymeric sheet while the microwires are attached to the substrate. The microwires are then detached from the substrate without removing the microwires from the polymeric sheet. The detaching step forms a separated polymeric sheet containing the detached microwires. Individual detached microwires of the plurality are approximately perpendicular to the separated polymeric sheet. A microwire array device includes a non-conductive polymeric sheet and a plurality of microwires. Individual microwires of the plurality have an independent length at least partially encapsulated by the polymeric sheet, are approximately perpendicular to the polymeric sheet, and contain magnetic ferrite.

A frequency sensor is provided. The frequency sensor may include: a magnetoresistive nano-oscillator including a magnetic heterostructure of at least a magnetic free layer, a magnetic reference layer and a non-magnetic intermediate layer arranged between the magnetic free layer and the magnetic reference layer; a coupling arrangement for coupling an incoming signal to at least one magnetic mode of the magnetic free layer, and a frequency estimator. The frequency estimator may be configured to: perform a plurality of voltage measurements across the magnetoresistive nano-oscillator over time; calculate a time averaged voltage across the magnetoresistive nano-oscillator based on the plurality of voltage measurements; estimate, over a finite range of frequencies, a frequency of the incoming signal based on the calculated time averaged voltage, and output a signal representative of the estimated frequency. A method of estimating a frequency of an incoming signal is also provided.

The present invention provides a method for producing a magnetic nanoparticle-coated laminate material. The method comprises coating a pair of opposed surfaces of a plurality of steel or iron/cobalt (Fe/Co) alloy film portions with a magnetic nanoparticle-containing coating. Each magnetic nanoparticle comprises a core and a shell covering at least a portion of the core. The shell and core are made of different materials selected from one or more of: iron, cobalt, nickel; and/or alloys comprising two or more of: iron, cobalt and/or nickel; and/or magnetic rare earth metals; and/or diamagnetic transition metals. The method further comprises stacking the coated film portions on top of each other such that a or each coated surface of each film portion is located adjacent a further coated surface of an adjacent film portion; and compressing the stacked coated film portions together to form a nanoparticle-coated laminate material.

Some variations provide a magnetically anisotropic structure comprising a magnetically anisotropic film on a substrate, wherein the magnetically anisotropic film contains a plurality of discrete magnetic hexaferrite particles, wherein the film is characterized by an average film thickness from 1 micron to 5 millimeters, and wherein the magnetically anisotropic film contains from 2 wt % to 75 wt % organic matter. Some variations provide a magnetically anisotropic structure comprising an out-of-plane magnetically anisotropic film on a substrate, wherein the magnetically anisotropic film contains a plurality of discrete magnetic hexaferrite particles, wherein the film is characterized by an average film thickness from 1 micron to 5 millimeters, and wherein the magnetically anisotropic film contains a concentration of hexaferrite particles of at least 40 vol %. The magnetically anisotropic structures are fabricated at low temperatures so that the magnetically anisotropic film may be monolithically integrated into an integrated-circuit fabrication process.

A permanent magnet may include a Fe.sub.16N.sub.2 phase in a strained state. In some examples, strain may be preserved within the permanent magnet by a technique that includes etching an iron nitride-containing workpiece including Fe.sub.16N.sub.2 to introduce texture, straining the workpiece, and annealing the workpiece. In some examples, strain may be preserved within the permanent magnet by a technique that includes applying at a first temperature a layer of material to an iron nitride-containing workpiece including Fe.sub.16N.sub.2, and bringing the layer of material and the iron nitride-containing workpiece to a second temperature, where the material has a different coefficient of thermal expansion than the iron nitride-containing workpiece. A permanent magnet including an Fe.sub.16N.sub.2 phase with preserved strain also is disclosed.

Magnet array structure includes a first linear magnet array having a plurality of consecutively arranged first Halbach arrays and a second linear magnet array having a plurality of consecutively arranged second Halbach arrays. The first linear magnet array, from a first end of the magnet array structure to a second end of the magnet array structure, having magnetic flux orientations rotating in a first direction, and the second linear magnet array, from the first end of the magnet array structure to the second end of the magnet array structure, having magnetic flux orientations rotating in a second direction that is opposite the first direction. The first linear magnet array is arranged parallel to the second linear magnet array so that, between the first and second ends of the magnet array structure, the first Halbach magnetic arrays are linearly offset from the second Halbach magnetic arrays.

Superparamagnetic nanocomposites are provided. In an embodiment, a superparamagnetic nanocomposite comprises a superparamagnetic core comprising a first, soft superparamagnetic ferrite and a superparamagnetic shell comprising a second, soft superparamagnetic ferrite, the shell formed over the core, wherein the first and second soft superparamagnetic ferrites are different compounds and have different magnetocrystalline anisotropies.

Disclosed herein is an apparatus for imaging nano magnetic particles using a 3D array of small magnets. A field-free region generation apparatus includes a hexahedral housing having an opening formed in the first surface thereof such that a measurement head is inserted into a spacing area, a pair of rectangular-shaped magnets installed respectively on two surfaces facing each other, among four surfaces perpendicular to the first surface of the housing, and a pair of magnet arrays installed respectively on the first surface of the housing and on another surface facing the first surface, each of the magnet arrays including multiple small magnets arranged along the edge of the opening.

The present invention relates to a soft robot using diamagnetic levitation. Such a soft robot using diamagnetic levitation is formed of a diamagnetic material to levitate on the ground on which a magnetic field is formed, and moves in a direction toward a predetermined point of a head part when the predetermined point of the head part is heated, and may thus move and change its direction in a state in which it is not in contact with the ground.

Provided is the use of a magnetic nanocomposite material that is capable of polymerising an anaerobic adhesive or other monomeric materials in need thereof as a nanoinitiator, in said polymerisation. Also disclosed herein is a method of manufacturing the magnetic nanocomposite material. In a preferred embodiment, the nanoinitiator is a magnetic nanoparticle core covered with a shell bearing dendrons that chelate an initiating metal ion of copper.