Magnetic field sensor constructed from a remagnetization line and one magnetoresistive resistor or a plurality of magnetoresistive resistors

US5521501A · kind A · utility

Assignee

• Institut fur Mikrostrukturtechnologie und Optoelektronik E.V. · DE

Inventors

• Fritz Dettmann · Solms, DE
• Uwe Loreit · Wetzlar, DE

Key dates

• Filing date: Jan 31, 1995
• Grant date: May 28, 1996
• Expiry date: Jan 31, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/09
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Described is a sensor based on the magnetoresistive effect and integrated into the thin-film arrangement of a remagnetization line in the form of a meander. In an adaptation to this meandering structure, the magnetoresistive film strips are provided in regions with alternating positive- and negative-inclined Barber pole structures. When periodic remagnetization of the regions takes place, a drift-free AC voltage is obtained as a sensor output signal. This lack of drift is the presupposition for the use of the magnetic field sensor for precise measurement of weak magnetic fields.