Open AccessMetastable states in magnetic nanorings
Author(s) -
Fernando Castaño,
C. A. Ross,
Cathrine Frandsen,
A. Eilez,
Darı́o Gil,
Henry I. Smith,
M. Redjdal,
F. B. Humphrey
Publication year - 2003
Publication title -
physical review. b, condensed matter
Language(s) - English
Resource type - Journals
eISSN - 1095-3795
pISSN - 0163-1829
DOI - 10.1103/physrevb.67.184425
Subject(s) - metastability , condensed matter physics , magnetization , vortex state , ferromagnetism , magnetic domain , hysteresis , magnetic force microscope , physics , state (computer science) , vortex , domain wall (magnetism) , domain (mathematical analysis) , magnetic flux , materials science , magnetic field , superconductivity , quantum mechanics , thermodynamics , mathematical analysis , mathematics , algorithm , computer science
Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215~Received 13 February 2003; published 30 May 2003!Magnetization states and hysteresis behavior of small ferromagnetic rings, of diameters 180–520 nm, havebeen investigated using magnetic force microscopy. In addition to the expected bi-domain ~‘‘onion’’! andux-closed ~‘‘vortex’’! magnetization states, a metastable state has been found. This ‘‘twisted’’ state contains a360° domain wall which can exist over a wide range of applied elds. Four possible congurations of thetwisted state are possible. Micromagnetic modeling shows that the twisted state is stabilised in small diameter,narrow rings. Additionally, more complex congurations such as double twisted states with two 360° wallshave been observed.DOI: 10.1103/PhysRevB.67.184425 PACS number~s!: 75.75.1a, 75.60.2d, 85.75.2dINTRODUCTION
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