Title :
Switching behavior of single nanowires inside dense nickel nanowire arrays
Author :
Nielsch, K. ; Hertel, R. ; Wehrspohn, R.B. ; Barthel, J. ; Kirschner, J. ; Gösele, U. ; Fischer, S.F. ; Kronmüller, H.
Author_Institution :
Max-Planck-Inst. of Microstructure Phys., Halle, Germany
fDate :
9/1/2002 12:00:00 AM
Abstract :
We report on the micromagnetic properties of highly regular hexagonal arrays of Ni nanowires, fabricated by means of electrodeposition in self-ordered porous alumina. Arrays with interpore distances of 65 and 100 nm and pore diameters of 25 and 30 nm are investigated. From hysteresis loops obtained from measurements with a superconducting quantum interference device (SQUID) magnetometer, the switching field Hsw of the nanowires and its deviation ΔHsw is derived. Dynamic micromagnetic modeling using the finite-element method is applied to study the reversal process in an external field. It is shown that starting at the wires´ ends, the reversal occurs by means of 180° head-on domain walls propagating along the wire.
Keywords :
arrays; electrodeposition; ferromagnetic materials; finite element analysis; magnetic anisotropy; magnetic domain walls; magnetic hysteresis; magnetic switching; magnetisation reversal; nanostructured materials; nickel; porosity; 100 nm; 25 nm; 30 nm; 65 nm; Ni; Ni nanowires; Ni-Al2O3; SQUID magnetometer; dense nickel nanowire arrays; dynamic micromagnetic modeling; electrodeposition; external field; finite-element method; head-on domain walls; highly regular hexagonal arrays; hysteresis loops; interpore distances; micromagnetic properties; pore diameters; reversal process; self-ordered porous alumina; single nanowires; superconducting quantum interference device; switching behavior; switching field; Finite element methods; Hysteresis; Interference; Magnetic field measurement; Magnetic switching; Micromagnetics; Nanowires; Nickel; SQUID magnetometers; Superconducting devices;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.801955
