University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, March 13th 2015
Speaker: Dan Dahlberg, University of Minnesota
Subject:  Low Frequency Noise in Mesoscopic Magnetic Dots

Measurements of random telegraph noise (RTN) in individual mesoscopic sized NiFe alloy dots will be presented; the dots dimensions are as small as 200nm x 200nm x 10nm [Appl. Phys. Lett. 104, 252408 (2014)]. The temperature and magnetic field dependence of the RTN are explained by the energy landscape in the dots; the energy landscape RTN was independently measured [Appl. Phys. Lett. 103, 042409 (2013)]. The research was motivated by questions raised in understanding magnetic noise in magnetic tunnel junctions and giant magnetoresistance devices [Appl. Phys. Lett. 95, 062512 (2009) and Phys. Rev. B 88, 014409 (2013)].

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