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    ELECTRIC FIELD SWITCHABLE MAGNETIC DEVICES
    41.
    发明申请
    ELECTRIC FIELD SWITCHABLE MAGNETIC DEVICES 有权

    公开(公告)号：US20220208241A1

    公开(公告)日：2022-06-30

    申请号：US17450852

    申请日：2021-10-14

    Applicant: Regents of the University of Minnesota

    Inventor： Jian-Ping Wang ,  Delin Zhang ,  Protyush Sahu

    IPC: G11C11/16 ,  H01L27/22 ,  H01L43/04 ,  G11C11/18 ,  H01L43/10 ,  H01L43/06

    Abstract: A magnetic device includes a layer stack comprising a first ferromagnetic layer; a spacer layer on the first ferromagnetic layer; a second ferromagnetic layer on the spacer layer; a dielectric barrier layer on the second ferromagnetic layer; an insertion layer positioned between the second ferromagnetic layer and the dielectric barrier layer; and a fixed layer or an electrode on the dielectric barrier layer. In some examples, a magnetic orientation of the second ferromagnetic layer is switched by a bias voltage across the layer stack without application of an external magnetic field; an antiferromagnetic coupling of the first and second ferromagnetic layers is increased by the bias voltage applying a negative charge to the fixed layer or the electrode, and the antiferromagnetic coupling of the first and second ferromagnetic layers is decreased by the bias voltage applying a positive charge to the fixed layer or the electrode.

    Preservation of strain in iron nitride magnet
    42.
    发明授权
    Preservation of strain in iron nitride magnet 有权

    公开(公告)号：US11217370B2

    公开(公告)日：2022-01-04

    申请号：US15546387

    申请日：2016-01-22

    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

    Inventor： Jian-Ping Wang ,  YanFeng Jiang

    IPC: H01F1/047 ,  H01F1/00 ,  H01F41/02 ,  C22C38/00 ,  C23C8/60 ,  C23C8/02 ,  C23C8/80 ,  C23C8/24 ,  C23C8/18 ,  C23C8/26

    Abstract: A permanent magnet may include a Fe16N2 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 Fe16N2 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 Fe16N2, 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 Fe16N2 phase with preserved strain also is disclosed.

    Iron-based nanoparticles and grains
    44.
    发明授权
    Iron-based nanoparticles and grains 有权

    公开(公告)号：US11161175B2

    公开(公告)日：2021-11-02

    申请号：US16340031

    申请日：2017-10-06

    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

    Inventor： Jian-Ping Wang ,  Bin Ma ,  Jinming Liu ,  Yiming Wu ,  YanFeng Jiang

    IPC: B22F1/02 ,  B22F1/00 ,  H01F1/055 ,  H01F1/059 ,  B22F9/04 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  C22C38/00 ,  C22C38/10

    Abstract: Example nanoparticles may include an iron-based core, and a shell. The shell may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example alloy compositions may include an iron-based grain, and a grain boundary. The grain boundary may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example techniques for forming iron-based core-shell nanoparticles may include depositing a shell on an iron-based core. The depositing may include immersing the iron-based core in a salt composition for a predetermined period of time. The depositing may include milling the iron-based core with a salt composition for a predetermined period of time. Example techniques for treating a composition comprising core-shell nanoparticles may include nitriding the composition.

    Method of making iron nitride powder with anisotropic shape
    46.
    发明授权
    Method of making iron nitride powder with anisotropic shape 有权

    公开(公告)号：US10562103B2

    公开(公告)日：2020-02-18

    申请号：US15546359

    申请日：2016-01-22

    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

    Inventor： Jian-Ping Wang ,  YanFeng Jiang

    IPC: B22F9/04 ,  B22F1/00 ,  C22C33/02 ,  H01F1/06 ,  H01F1/08 ,  C23C8/26 ,  H01F41/02

    Abstract: Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one a″-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one a″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.

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