A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

The present invention is directed to a magnetic memory element including a magnetic free layer structure incorporating two magnetic free layers separated by a perpendicular enhancement layer (PEL) and having a variable magnetization direction substantially perpendicular to layer planes thereof; an insulating tunnel junction layer formed adjacent to the magnetic free layer structure; a magnetic reference layer structure formed adjacent to the insulating tunnel junction layer opposite the magnetic free layer structure; an anti-ferromagnetic coupling layer formed adjacent to the magnetic reference layer structure; and a magnetic fixed layer formed adjacent to the anti-ferromagnetic coupling layer. The magnetic reference layer structure includes first, second, and third magnetic reference layers separated by two PELs and having a first invariable magnetization direction substantially perpendicular to layer planes thereof. The magnetic fixed layer has a second invariable magnetization direction substantially opposite to the first invariable magnetization direction.

A drug delivery system including: an oblong housing including a setting structure to set a dose of a drug via an angular position; and a sensor structure to determine the dose, including a magnet and a magnetic sensor, arranged so that at least one of an angular position and a displacement of the magnetic sensor relative to the magnet may be determined as a function of the electrical resistance of the magnetic sensor. The sensor structure is arranged in relation to the setting structure so that the angular position of the setting structure is determined as a function of the angular position and/or the displacement of the magnetic sensor. A sensor structure is also described including: a flexible foil, including a magnetic sensor, in a cylindrical shape configuration comprising an axis; and a magnet arranged at a line parallel to or collinear with the axis.

A porous metamaterial is disclosed, comprising a matrix (101) having a plurality of voids (103) therein, wherein a content of interest (104) is trapped within each of at least part of the voids (103), detached from the matrix (101), thereby providing a respective unit-cell (100) of the metamaterial, with an intended predetermined property associated with the presence of the content of interest (104) within the at least one void (103). A variety of applications of the disclosed metamaterials are presented, including armors having either non-Newtonian fluids or magnetic particles confined within the voids as a content of interest. Upon subjecting the magnetic particles to a rotating magnetic field, the magnetic particles spin within the voids and gain angular momentum, thereby improving the resistance of the armor against penetration. Systems and methods for manufacturing porous metamaterial units having contents of interest confined within voids therein, are also disclosed.

A porous metamaterial is disclosed, comprising a matrix (101) having a plurality of voids (103) therein, wherein a content of interest (104) is trapped within each of at least part of the voids (103), detached from the matrix (101), thereby providing a respective unit-cell (100) of the metamaterial, with an intended predetermined property associated with the presence of the content of interest (104) within the at least one void (103). A variety of applications of the disclosed metamaterials are presented, including armors having either non-Newtonian fluids or magnetic particles confined within the voids as a content of interest. Upon subjecting the magnetic particles to a rotating magnetic field, the magnetic particles spin within the voids and gain angular momentum, thereby improving the resistance of the armor against penetration. Systems and methods for manufacturing porous metamaterial units having contents of interest confined within voids therein, are also disclosed.

Ferromagnetic materials are disclosed that comprise at least one Dirac half metal material. In addition, Dirac half metal materials are disclosed, wherein the material comprises a plurality of massless Dirac electrons. In addition, ferromagnetic materials are disclosed that includes at least one Dirac half metal material, wherein the material comprises a plurality of massless Dirac electrons, wherein the material exhibits 100% spin polarization, and wherein the plurality of electrons exhibit ultrahigh mobility. Spintronic devices and heterostructures are also disclosed that include a Dirac half metal material.

Provided are a novel immuno-optomagnetic point-of-care (PoC) assay and in particular, a method for detecting an analyte using magnetic nanoparticles and quantum dots (QD) having antibodies which are interfaced with the fabricated PoC biochip platform for quantitative analysis, and an immuno-optomagnetic detection method. The method also relates to methods of making such a plurality of conjugated magnetic quantum dot nanoparticles, methods of detecting analytes using such a plurality of conjugated quantum dot nanoparticles.

Various embodiments include an electrical device comprising an antiferromagnetic topological insulator having a surface comprising a bulk domain wall configured to support a first type of 1D chiral channel, a surface step configured to support a second 1D chiral channel and intersecting the bulk domain wall to form thereat a quantum point junction.

A detection method and sensors are provided for the rapid detection of chemicals, biological and non-biological, and a wide range of viruses using magnetic tunnel junction-based molecular spintronics devices (MTJMSD) that produce unique magnetic resonance signals before and after interacting with target chemical, biochemical, viral, and other molecular agents.