Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Magnetic switching fluctuations from sidewall oxides in MgO/FeCoB magnetic tunnel junctions



Joshua M. Pomeroy, J C. Read


Sharp magnetic switching distributions with coupling to magnetic sidewall oxides in FeCoB/MgO magnetic tunnel junctions (MTJs) are revealed by magneto-resistance first order reversal curve (MR-FORC) measurements. Tunneling magneto-resistance (TMR) and FORC data in units of % TMR/mT2 are shown for two identical devices that differ only by the annealing. The annealed sample has much larger TMR and correspondingly higher switching density q. In both cases, the MR-FORC data exhibit a prominent “checkerboard” pattern that implies coupling to magnetic oxides on the MTJ sidewalls.
Applied Physics Letters
Created August 30, 2011, Updated February 19, 2017