公开(公告)号：US20240076764A1

公开(公告)日：2024-03-07

申请号：US18506394

申请日：2023-11-10

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  YanFeng JIANG ,  Md MEHEDI ,  Yiming WU ,  Bin MA ,  Jinming LIU ,  Delin ZHANG

IPC: C22C38/00 ,  C22C33/00 ,  H01F1/11 ,  H01F7/02 ,  H01F41/02

CPC classification number: C22C38/001 ,  C22C33/006 ,  H01F1/11 ,  H01F7/021 ,  H01F41/0253 ,  C22C2200/04 ,  C22C2202/02

Abstract: All example composition may include a plurality of grains including an iron nitride phase. The plurality of grains may have an average wain size between about 10 nm and about 200 nm. An example technique may include treating a composition including a plurality of grains including au iron-based phase to adjust an average grain size of the plurality of grains to between about 20 nm and about 100 ma. The example technique may include nitriding the plurality of grains to form or grow an iron nitride phase.

公开(公告)号：US20230413692A1

公开(公告)日：2023-12-21

申请号：US18338318

申请日：2023-06-20

Applicant: UNIVERSITY OF MARYLAND, COLLEGE PARK ,  REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Cheng GONG ,  Tony LOW ,  Jian-Ping WANG

IPC: H10N70/20 ,  H10N70/00

CPC classification number: H10N70/25 ,  H10N70/841 ,  H10N70/823 ,  H10N70/8822 ,  H10N70/8825 ,  H10N70/8845 ,  H10N70/021

Abstract: Disclosed are energy efficient ferroelectric devices and methods for making such devices. For example, a ferroelectric device may be a ferroelectric tunneling junction device that includes a graphene layer on a substrate. A tunneling layer may be disposed on a portion of the graphene layer. The tunneling layer may be a ferroelectric material. A metal electrical contact layer may be disposed over the tunneling layer and the graphene layer. Additionally, some embodiments may have an additional monolayer disposed between the tunneling layer and graphene layer. By specific engineering of such layers, tunneling electroresistance performance may be substantially improved.

公开(公告)号：US20230024845A1

公开(公告)日：2023-01-26

申请号：US17945203

申请日：2022-09-15

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  YanFeng JIANG

IPC: B22F9/04 ,  C22C33/02 ,  H01F1/06 ,  H01F1/08 ,  B22F1/054 ,  C01B21/06 ,  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 α″-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 α″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.

公开(公告)号：US20240290539A1

公开(公告)日：2024-08-29

申请号：US18642092

申请日：2024-04-22

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  YanFeng JIANG

IPC: H01F41/02 ,  B22D27/02 ,  C22C38/00 ,  H01F1/047 ,  H01F1/06 ,  H01F1/08 ,  H02K1/02

CPC classification number: H01F41/0273 ,  B22D27/02 ,  C22C38/001 ,  H01F1/047 ,  H01F1/06 ,  H01F1/08 ,  H01F41/0266 ,  H02K1/02

Abstract: Techniques are disclosed concerning applied magnetic field synthesis and processing of iron nitride magnetic materials. Some methods concern casting a material including iron in the presence of an applied magnetic field to form a workpiece including at least one iron-based phase domain including uniaxial magnetic anisotropy, wherein the applied magnetic field has a strength of at least about 0.01 Tesla (T). Also disclosed are workpieces made by such methods, apparatus for making such workpieces and bulk materials made by such methods.

公开(公告)号：US20220093296A1

公开(公告)日：2022-03-24

申请号：US17543863

申请日：2021-12-07

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.

公开(公告)号：US20170243680A1

公开(公告)日：2017-08-24

申请号：US15501697

申请日：2015-08-05

Applicant: Regents of the University of Minnesota

Inventor： Jian-Ping WANG ,  Yanfeng JIANG

IPC: H01F1/059 ,  C23C16/34 ,  C23C16/56 ,  H02K1/02 ,  H01F41/22

CPC classification number: H01F1/059 ,  C23C16/34 ,  C23C16/448 ,  C23C16/45561 ,  C23C16/507 ,  C23C16/56 ,  C30B19/00 ,  C30B25/00 ,  C30B29/38 ,  C30B29/68 ,  H01F10/147 ,  H01F41/20 ,  H01F41/22 ,  H01F41/28 ,  H02K1/02

Abstract: The disclosure describes multilayer hard magnetic materials including at least one layer including α″-Fe16N2 and at least one layer including α″-Fe16(NxZ1-x)2 or a mixture of α″-Fe16N2 and α″-Fe16Z2, where Z includes at least one of C, B, or O, and x is a number greater than zero and less than one. The disclosure also describes techniques for forming multilayer hard magnetic materials including at least one layer including α″-Fe16N2 and at least one layer including α″-Fe16(NxZ1-x)2 or a mixture of α″-Fe16N2 and α″-Fe16Z2 using chemical vapor deposition or liquid phase epitaxy.

公开(公告)号：US20240055165A1

公开(公告)日：2024-02-15

申请号：US18494838

申请日：2023-10-26

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  Bin MA ,  Jinming LIU ,  Yiming WU ,  YanFeng JIANG

IPC: H01F1/06 ,  B22F9/04 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  H01F1/055 ,  H01F1/059 ,  C22C38/00 ,  C22C38/10 ,  B22F1/16 ,  B22F1/054

CPC classification number: H01F1/065 ,  B22F9/04 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  H01F1/0551 ,  H01F1/059 ,  C22C38/00 ,  C22C38/001 ,  C22C38/10 ,  B22F1/16 ,  B22F1/054 ,  H01F1/061 ,  B22F1/0553 ,  B22F2301/35 ,  B22F2302/20 ,  B22F2304/054 ,  H01F1/0552 ,  B22F1/0547

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.

公开(公告)号：US20220098711A1

公开(公告)日：2022-03-31

申请号：US16610285

申请日：2018-05-04

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  YanFeng JIANG ,  Md MEHEDI ,  Yiming WU ,  Bin MA ,  Jinming LIU ,  Delin ZHANG

IPC: C22C38/00 ,  H01F41/02 ,  H01F7/02 ,  H01F1/11 ,  C22C33/00

Abstract: An example composition may include a plurality of grains including an iron nitride phase. The plurality of grains may have an average grain size between about 10 nm and about 200 nm. An example technique may include treating a composition including a plurality of grains including an iron-based phase to adjust an average grain size of the plurality of grains to between about 20 nm and about 100 nm. The example technique may include nitriding the plurality of grains to form or grow an iron nitride phase.

公开(公告)号：US20220080500A1

公开(公告)日：2022-03-17

申请号：US17490800

申请日：2021-09-30

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  Bin MA ,  Jinming LIU ,  Yiming WU ,  YanFeng JIANG

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

公开(公告)号：US20180025841A1

公开(公告)日：2018-01-25

申请号：US15546407

申请日：2015-07-22

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping WANG ,  YanFeng JIANG

IPC: H01F41/02 ,  H02K1/02 ,  H01F1/06 ,  H01F1/047

CPC classification number: H01F41/0273 ,  B22D27/02 ,  C22C38/001 ,  H01F1/047 ,  H01F1/06 ,  H01F1/08 ,  H01F41/0266 ,  H02K1/02

Abstract: Techniques are disclosed concerning applied magnetic field synthesis and processing of iron nitride magnetic materials. Some methods concern casting a material including iron in the presence of an applied magnetic field to form a workpiece including at least one ironbased phase domain including uniaxial magnetic anisotropy, wherein the applied magnetic field has a strength of at least about 0.01 Tesla (T). Also disclosed are workpieces made by such methods, apparatus for making such workpieces and bulk materials made by such methods.