The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 2021
Filed:
Jul. 09, 2019
International Business Machines Corporation, Armonk, NY (US);
Icko E. T. Iben, Santa Clara, CA (US);
Lee Curtis Randall, Tucson, AZ (US);
Wlodzimierz Stanley Czarnecki, Palo Alto, CA (US);
Jason Liang, Campbell, CA (US);
Ernest Stewart Gale, Tucson, AZ (US);
David Lee Swanson, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method includes determining whether a tunneling magnetoresistance (TMR) sensor is corroded using resistance, amplitude and signal to noise ratio (SNR) measurements of the sensor. A method to determine whether a TMR sensor is corroded includes determining an expected initial resistance value, Rand measuring a resistance value, R, of the sensor. The method includes calculating a ratio of the Rvalue and the expected initial resistance value, Rand determining whether the ratio is in a predefined range for the TMR sensor. In response to determining that the ratio of the sensor is within the predefined range, the method includes outputting an indication that the TMR sensor is corroded. In response to determining that the ratio of the sensor is outside the predefined range, the method includes outputting an indication that the TMR sensor is not corroded.