Noise in Mesoscale Magnetic Dots From Random Telegraph Noise to 1/ Noise

• Published in: IEEE transactions on magnetics Vol. 55; no. 2; pp. 1 - 3
• Main Authors: Costanzi, Barry N., Endean, Daniel E., Dahlberg, E. Dan
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-02-2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 1/<italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">f noise; Chains; Energy measurement; Ferrous alloys; Frequency measurement; Magnetic alloys; Magnetic hysteresis; magnetic noise; Magnetism; Magnetization; mesoscale magnetic dots; Noise; Oscillators; Perpendicular magnetic anisotropy; random telegraph noise (RTN); Superposition (mathematics)
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2018.2864118

The noise in permalloy magnetic square shaped dots and chains of dots has been investigated. With the application of a magnetic field to control the energy barriers, individual dots exhibit random telegraph noise (RTN). The noise spectrum of chains of dots, the superposition of the RTN of individual dots, exhibits a 1/<inline-formula> <tex-math notation="LaTeX">{f} </tex-math></inline-formula> noise spectrum.