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Title: Gas sensor

Abstract

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.

Inventors:
; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1158792
Patent Number(s):
8,826,726
Application Number:
13/318,522
Assignee:
The Regents of the University of California (Oakland, CA)
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Schmid, Andreas K., Mascaraque, Arantzazu, Santos, Benito, and de la Figuera, Juan. Gas sensor. United States: N. p., 2014. Web.
Schmid, Andreas K., Mascaraque, Arantzazu, Santos, Benito, & de la Figuera, Juan. Gas sensor. United States.
Schmid, Andreas K., Mascaraque, Arantzazu, Santos, Benito, and de la Figuera, Juan. Tue . "Gas sensor". United States. https://www.osti.gov/servlets/purl/1158792.
@article{osti_1158792,
title = {Gas sensor},
author = {Schmid, Andreas K. and Mascaraque, Arantzazu and Santos, Benito and de la Figuera, Juan},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {9}
}

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Works referenced in this record:

Reversible H-Induced Switching of the Magnetic Easy Axis in N i / C u ( 001 ) Thin Films
journal, December 2004


Structure and morphology of ultrathinCo/Ru(0001) films
journal, March 2007


Imaging Spin-Reorientation Transitions in Consecutive Atomic Co Layers on Ru(0001)
journal, April 2006


Hydrogen-induced reversible spin-reorientation transition and magnetic stripe domain phase in bilayer Co on Ru(0001)
journal, April 2012