公开(公告)号：US20250164585A1

公开(公告)日：2025-05-22

申请号：US18511743

申请日：2023-11-16

Applicant: Allegro MicroSystems, LLC

Inventor： Paolo Campiglio ,  Samridh Jaiswal ,  Maxime Rioult ,  Noémie Belin

IPC: G01R33/09 ,  H01F10/32 ,  H10N50/01 ,  H10N50/10

Abstract: Methods and apparatus for a device having a TMR element that includes a free layer, a spacer layer, and a reference layer. In embodiments, the free layer comprises a vortex layer configured to provide a magnetic vortex, and a coupling layer magnetically coupled to the vortex layer to modulate the vortex in the vortex layer.

公开(公告)号：US20230332878A1

公开(公告)日：2023-10-19

申请号：US18337829

申请日：2023-06-20

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Solène Bastien ,  Paul A. David ,  Maxime Rioult ,  Alexander Latham ,  Shaun Veilleux

IPC: G01B7/30 ,  G01R33/00 ,  G01R33/09

CPC classification number: G01B7/30 ,  G01R33/0094 ,  G01R33/098 ,  G01R33/091

Abstract: In one aspect, an angle sensor includes a first plurality of magnetoresistance elements located at a first location on an axis and a second plurality of magnetoresistance elements located at a second location on the axis. The first plurality of magnetoresistance elements includes a first one or more magnetoresistance elements each having a reference direction in a first direction; and a second one or more magnetoresistance elements each having a reference direction in a second direction. The second plurality of magnetoresistance elements includes a third one or more magnetoresistance elements each having a reference direction in the first direction, and a fourth one or more magnetoresistance elements each having a reference direction in the second direction. The angle sensor senses movement of a magnetic target, and the magnetic target is a ring magnet or a single pole magnet.

公开(公告)号：US20220128379A1

公开(公告)日：2022-04-28

申请号：US17647350

申请日：2022-01-07

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Jeffrey Eagen ,  Damien Dehu ,  Paul A. David ,  Andrea Foletto ,  Maxime Rioult

IPC: G01D5/16 ,  G01R33/09

Abstract: Methods and apparatus that can include a rotatable target to generate a sinusoidal signal in a magnetic field sensor, wherein the target includes a plurality of sinusoidal teeth to reduce angular error. A magnetic field sensor can be configured to determine a position of the target. In embodiments, a rotatable target to generate a sinusoidal signal in a magnetic field sensor can include a plurality of sinusoidal teeth and a number of harmonics to reduce angular error.

公开(公告)号：US20240418805A1

公开(公告)日：2024-12-19

申请号：US18333765

申请日：2023-06-13

Applicant: Allegro MicroSystems, LLC ,  Commissariat à l'énergie atomique et aux énergies alternatives

Inventor： Paolo Campiglio ,  Doan Nguyen Ba ,  Maxime Rioult ,  Aurélie Solignac ,  Jean-Michel Daga

IPC: G01R33/09 ,  H10N50/01 ,  H10N50/10 ,  H10N50/85

Abstract: In one aspect, a method includes manufacturing a tunneling magnetoresistance (TMR) element to sense out-of-plane changes in magnetic field intensity in a magnetic field. The manufacturing includes depositing a plurality of antiferromagnetic layers having magnetization directions alternating by layer between a first direction and a second direction opposite the first direction. A top layer of the plurality of antiferromagnetic layers has a magnetization direction in the first direction. The manufacturing also includes depositing a ferromagnetic layer directly on the top layer; depositing a first multilayer structure directly on the ferromagnetic layer; depositing a metal layer directly on the first multilayer structure; and depositing a second multilayer structure directly on the metal layer. The ferromagnetic layer, the first multilayer structure, and the second multilayer structure are each parallel to an x-y plane and the first direction is either in a z-direction or in a −z direction.

公开(公告)号：US20220244328A1

公开(公告)日：2022-08-04

申请号：US17166301

申请日：2021-02-03

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Maxime Rioult

IPC: G01R33/09 ,  H01L43/08 ,  H01L43/02 ,  H01L43/10

Abstract: In one aspect, a linear sensor includes at least one magnetoresistance element that includes a first spin valve and a second spin valve positioned on the first spin valve. The first spin valve includes a first set of reference layers having a magnetization direction in a first direction and a first set of free layers having a magnetization direction in a second direction orthogonal to the first direction. The second spin valve includes a second set of reference layers having a magnetization direction in the first direction and a second set of free layers having a magnetization direction in a third direction orthogonal to the first direction and antiparallel to the second direction. The first direction is neither parallel nor antiparallel to a direction of an expected magnetic field.

公开(公告)号：US20210011096A1

公开(公告)日：2021-01-14

申请号：US16507560

申请日：2019-07-10

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Maxime Rioult ,  Jean-Michel Daga

IPC: G01R33/00 ,  G01D5/14

Abstract: A magnetic field sensor responsive to a movement of a target object can include a plurality of magnetoresistance elements arranged in a line and having a span according to y(1−1/x), where y is equal a full spatial period of the target object and where x is equal to a total quantity of magnetoresistance elements in the plurality of magnetoresistance elements. The plurality of magnetic field sensing elements is operable to generate a signal that is substantially not responsive to the movement of the target object but is responsive to stray external magnetic fields.

公开(公告)号：US11686599B2

公开(公告)日：2023-06-27

申请号：US17647350

申请日：2022-01-07

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Jeffrey Eagen ,  Damien Dehu ,  Paul A. David ,  Andrea Foletto ,  Maxime Rioult

IPC: G01D5/16 ,  G01R33/09

CPC classification number: G01D5/16 ,  G01R33/091

Abstract: Methods and apparatus that can include a rotatable target to generate a sinusoidal signal in a magnetic field sensor, wherein the target includes a plurality of sinusoidal teeth to reduce angular error. A magnetic field sensor can be configured to determine a position of the target. In embodiments, a rotatable target to generate a sinusoidal signal in a magnetic field sensor can include a plurality of sinusoidal teeth and a number of harmonics to reduce angular error.

公开(公告)号：US11630168B2

公开(公告)日：2023-04-18

申请号：US17166301

申请日：2021-02-03

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Maxime Rioult

IPC: G01R33/09 ,  H10N50/85 ,  H10N50/80 ,  H10N50/10 ,  H01L43/10 ,  H01L43/02 ,  H01L43/08

Abstract: In one aspect, a linear sensor includes at least one magnetoresistance element that includes a first spin valve and a second spin valve positioned on the first spin valve. The first spin valve includes a first set of reference layers having a magnetization direction in a first direction and a first set of free layers having a magnetization direction in a second direction orthogonal to the first direction. The second spin valve includes a second set of reference layers having a magnetization direction in the first direction and a second set of free layers having a magnetization direction in a third direction orthogonal to the first direction and antiparallel to the second direction. The first direction is neither parallel nor antiparallel to a direction of an expected magnetic field.

公开(公告)号：US11327127B2

公开(公告)日：2022-05-10

申请号：US16507560

申请日：2019-07-10

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Maxime Rioult ,  Jean-Michel Daga

IPC: G01R33/00 ,  G01D5/14

Abstract: A magnetic field sensor responsive to a movement of a target object can include a plurality of magnetoresistance elements arranged in a line and having a span according to y(1−1/x), where y is equal a full spatial period of the target object and where x is equal to a total quantity of magnetoresistance elements in the plurality of magnetoresistance elements. The plurality of magnetic field sensing elements is operable to generate a signal that is substantially not responsive to the movement of the target object but is responsive to stray external magnetic fields.

公开(公告)号：US11852699B2

公开(公告)日：2023-12-26

申请号：US18175829

申请日：2023-02-28

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Maxime Rioult

IPC: G01R33/09 ,  H10N50/10 ,  H10N50/80 ,  H10N50/85 ,  G11B5/39

CPC classification number: G01R33/093 ,  G01R33/098 ,  H10N50/10 ,  H10N50/80 ,  H10N50/85 ,  G11B5/39

Abstract: In one aspect, a linear sensor includes at least one magnetoresistance element that includes a first spin valve and a second spin valve positioned on the first spin valve. The first spin valve includes a first set of reference layers having a magnetization direction in a first direction and a first set of free layers having a magnetization direction in a second direction orthogonal to the first direction. The second spin valve includes a second set of reference layers having a magnetization direction in the first direction and a second set of free layers having a magnetization direction in a third direction orthogonal to the first direction and antiparallel to the second direction. The first direction is neither parallel nor antiparallel to a direction of an expected magnetic field.