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Title: Magnetic thin-film split-domain current sensor-recorder

Abstract

A sensor-recorder for recording a representation of the direction and peak amplitude of a transient current. A magnetic thin film is coated on a glass substrate under the influence of a magnetic field so that the finished film is magnetically uniaxial and anisotropic. The film is split into two oppositely magnetized contiguous domains with a central boundary by subjecting adjacent portions of the film simultaneously to magnetic fields that are opposed 180.degree.. With the split-domain sensor-recorder placed with the film plane and domain boundary either perpendicular or parallel to the expected conductive path of a transient current, the occurrence of the transient causes switching of a portion of one domain to the direction of the other domain. The amount of the switched domain portion is indicative of the amplitude of the peak current of the transient, while the particular domain that is switched is indicative of the direction of the current. The resulting domain patterns may be read with a passive magnetic tape viewer.

Inventors:
 [1]
  1. Livermore, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
863477
Patent Number(s):
4180775
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
magnetic; thin-film; split-domain; current; sensor-recorder; recording; representation; direction; peak; amplitude; transient; film; coated; glass; substrate; influence; field; finished; magnetically; uniaxial; anisotropic; split; oppositely; magnetized; contiguous; domains; central; boundary; subjecting; adjacent; portions; simultaneously; fields; opposed; 180; degree; placed; plane; domain; perpendicular; parallel; expected; conductive; path; occurrence; causes; switching; portion; amount; switched; indicative; particular; resulting; patterns; passive; tape; viewer; peak current; passive magnetic; magnetic field; magnetic fields; glass substrate; conductive path; current sensor; transient current; adjacent portions; peak amplitude; magnetic tape; main portion; /324/

Citation Formats

Hsieh, Edmund J. Magnetic thin-film split-domain current sensor-recorder. United States: N. p., 1979. Web.
Hsieh, Edmund J. Magnetic thin-film split-domain current sensor-recorder. United States.
Hsieh, Edmund J. Mon . "Magnetic thin-film split-domain current sensor-recorder". United States. https://www.osti.gov/servlets/purl/863477.
@article{osti_863477,
title = {Magnetic thin-film split-domain current sensor-recorder},
author = {Hsieh, Edmund J},
abstractNote = {A sensor-recorder for recording a representation of the direction and peak amplitude of a transient current. A magnetic thin film is coated on a glass substrate under the influence of a magnetic field so that the finished film is magnetically uniaxial and anisotropic. The film is split into two oppositely magnetized contiguous domains with a central boundary by subjecting adjacent portions of the film simultaneously to magnetic fields that are opposed 180.degree.. With the split-domain sensor-recorder placed with the film plane and domain boundary either perpendicular or parallel to the expected conductive path of a transient current, the occurrence of the transient causes switching of a portion of one domain to the direction of the other domain. The amount of the switched domain portion is indicative of the amplitude of the peak current of the transient, while the particular domain that is switched is indicative of the direction of the current. The resulting domain patterns may be read with a passive magnetic tape viewer.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

Patent:

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