NDLI: 360/spl deg/ angle sensor using spin valve materials with SAF structure

Content Provider	IEEE Xplore Digital Library
Author	Dexin Wang Brown, J. Hazelton, T. Daughton, J.
Copyright Year	1965
Abstract	Microchips of 360/spl deg/ angle sensors using spin valve materials were designed, fabricated, and tested with excellent performance. The spin valve material used for the angle sensor has a structure of Ta-NiFeCo-CoFe-Cu-CoFe-Ru-CoFe-CrMnPt. External magnetic fields have little torque on the CoFe-Ru-CoFe structure up to at least 500Oe, which is the highest value available during the test. This is due to the strong antiparallel exchange coupling between the two CoFe sublayers of the same thickness via a thin layer of Ru and the resulting zero net magnetic moment. There is a sharp switching of the free layer with a low coercivity of 4 Oe along the easy axis. Both the high standoff field and small coercivity ensure that the sensor operates properly with large tolerance in mechanical assembly. The angle sensor is used stationary in combination with a disc-shaped permanent magnet attached to a rotating shaft near the sensor. The permanent magnet is magnetized in-plane, thus creating a field that is rotating with the shaft. The magnetic field from the permanent magnet forces the free layer magnetization to follow the field and rotate with it. With a fixed reference layer magnetization and an in-phase following of the free layer magnetization, the magnetoresistance is a simple cosine function of the angle between the rotating permanent magnet and the stationary sensor. A special Wheatstone-bridge with four spin valve resistors is used to compensate the thermal drift expected in application environments. One half bridge has a 90/spl deg/ phase delay from the other, resulting in a cosine and a sine function, in combination to uniquely determine any angular relationship between the permanent magnet and the sensor between 0 to 360/spl deg/.
Sponsorship	IEEE Magnetics Society
Starting Page	3700
Ending Page	3702
Page Count	3
File Size	468543
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spin valves Magnetic sensors Permanent magnets Magnetic materials Mechanical sensors Magnetization Magnetic fields Coercive force Shafts Materials testing sputtering Angular position sensor GMR magnetic sensor microchip spin valves
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

360/spl deg/ domain wall investigation for sensor applications

Precision X-Y robotic object handling using a dual GMR bridge sensor

Development of a high precision absolute linear displacement sensor utilizing GMR spin-valves

Microtrack base line instability of spin valve heads

Giant magnetoresistance effect in CoNiFe/Cu spin valves

Effects of pumping time on GMR and coercivity of RF-sputtered MRAM dual spin-valves

Magnetization processes in spin-valve meanders for sensor applications

Effect of permanent magnet coercivity on transfer curve of shielded spin-valve head

The Optimum Layout for Giant Magneto-Resistive Angle Sensors

360/spl deg/ angle sensor using spin valve materials with SAF structure

Similar Documents

360/spl deg/ domain wall investigation for sensor applications

Precision X-Y robotic object handling using a dual GMR bridge sensor

Development of a high precision absolute linear displacement sensor utilizing GMR spin-valves

Microtrack base line instability of spin valve heads

Giant magnetoresistance effect in CoNiFe/Cu spin valves

Effects of pumping time on GMR and coercivity of RF-sputtered MRAM dual spin-valves

Magnetization processes in spin-valve meanders for sensor applications

Effect of permanent magnet coercivity on transfer curve of shielded spin-valve head

The Optimum Layout for Giant Magneto-Resistive Angle Sensors

360/spl deg/ angle sensor using spin valve materials with SAF structure