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

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2571

Lastpage

2573

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 H_sw of the nanowires and its deviation ΔH_sw 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801955

Filename

1042270