Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Applications of Giant Magnetoresitance Spin-Valve Transpinnor for Magneto-Electronics



S E. Bae, S Zurn, William F. Egelhoff Jr., P J. Chen, E J. Torok, R Spitzer, J H. Judy


This paper discusses the applications of a Transpinnor, a new kind of active solid-state device utilizing giant magnetoresitance (GMR) spin valves, for the state of art of magneto-electronic device technology. A Transpinnor is a modified Wheatstone bridge circuit composed of four GMR spin-valves whose resistance can be changed by the magnetic field from current flowing in one or more striplines that overlay the spin-valves but are not resistively connected to one each other. Closed-flux structure of metallic pseudo spin-valves and anti-ferromagnetic oxide α-Fe2O3 exchange biased bottom spin-valves were used for the each GMR leg of a Transpinnor. Based on experimental results including electrical, GMR, and magnetic properties, a single and dual input Transpinnor can be designed as various kinds of magneto-electronic devices. As a transformer, it can be used to step voltages and flat current up and down. As an electronic device, it can be substituted for many different logic and semiconductor devices such as d.c differential amplifiers, AND, OR, NOR, XOR logic gates, and newly designed multi-valued logic gates. In particular, the stable current-driven characteristics of a single and dual input Transpinnor with large input current suggest that it can be used as a new current-driver instead of CMOS semiconductor current-driver for a GMR magnetic random access memory (MRAM) technology.
IEEE Transactions on Magnetics


bottom GMR spin-valves, differential amplifier, giant magnetoresistance, magneto-electronics, pseudo spin-valves, random access memory, Transpinnor, various logic gates, wheatstone bridge


Bae, S. , Zurn, S. , Egelhoff Jr., W. , Chen, P. , Torok, E. , Spitzer, R. and Judy, J. (2021), Applications of Giant Magnetoresitance Spin-Valve Transpinnor for Magneto-Electronics, IEEE Transactions on Magnetics (Accessed July 19, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created October 12, 2021