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1. (US20120131988) Gas sensor

Office : United States of America
Application Number: 13318522 Application Date: 29.04.2010
Publication Number: 20120131988 Publication Date: 31.05.2012
Grant Number: 08826726 Grant Date: 09.09.2014
Publication Kind : B2
Prior PCT appl.: Application Number:PCTUS2010032990 ; Publication Number: Click to see the data
IPC:
G01R 33/00
G01N 27/72
G01N 27/74
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27
Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
72
by investigating magnetic variables
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27
Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
72
by investigating magnetic variables
74
of fluids
Applicants: The Regents of the University of California
Santos Benito
Inventors: Schmid Andreas K.
Mascaraque Arantzazu
Agents: Lawrence Berkeley National Laboratory
Priority Data:
Title: (EN) Gas sensor
Abstract: front page image
(EN)

A gas sensor is described which incorporates a sensor stack comprising a first film layer of a ferromagnetic material, a spacer layer, and a second film layer of the ferromagnetic material. The first film layer is fabricated so that it exhibits a dependence of its magnetic anisotropy direction on the presence of a gas, That is, the orientation of the easy axis of magnetization will flip from out-of-plane to in-plane when the gas to be detected is present in sufficient concentration. By monitoring the change in resistance of the sensor stack when the orientation of the first layer's magnetization changes, and correlating that change with temperature one can determine both the identity and relative concentration of the detected gas. In one embodiment the stack sensor comprises a top ferromagnetic layer two mono layers thick of cobalt deposited upon a spacer layer of ruthenium, which in turn has a second layer of cobalt disposed on its other side, this second cobalt layer in contact with a programmable heater chip.


Also published as:
WO/2010/129390