Field and Current Driven Magnetic Domain Wall Motion in Disordered A1-FePt Nanowires

Author

Pin Ho ; Jinshuo Zhang ; Currivan-Incorvia, Jean Anne ; Bono, David C. ; Ross, Caroline A.

Author_Institution

Dept. of Mater. Sci. & Eng., Massachusetts Inst. of Technol., Cambridge, MA, USA

Volume

6

fYear

2015

fDate

2015

Firstpage

1

Lastpage

4

Abstract

Arc-shaped magnetic FePt nanowires (10nm thick, 375nm wide) displaying in-plane anisotropy were fabricated. A vortex domain wall was formed in the middle of the arc after in-plane saturation in a field perpendicular to the wire. Translational domain wall propagation was observed at a field of 40 Oe applied parallel to the wire, while complete propagation to the end of the arc occurred at 100 Oe. Domain wall displacement at low velocity was achieved by current pulses of 2.5 10¹¹ A m² at zero applied magnetic field, comparable to the zero-field threshold current density of Permalloy. A field-assisted spin transfer torque drove the domain wall 1.8m to the end of the arc.

Keywords

Permalloy; current density; magnetic anisotropy; magnetic domain walls; nanomagnetics; nanowires; FePt; Permalloy; current driven magnetic domain wall motion; disordered nanowires; field assisted spin transfer torque; field driven magnetic domain wall motion; in-plane anisotropy; size 10 nm; size 375 nm; translational domain wall propagation; vortex domain wall; zero field threshold current density; Anisotropic magnetoresistance; Magnetic domain walls; Magnetic domains; Nanowires; Saturation magnetization; Wires; Spin electronics; domain wall motion; magnetic nanowires; spin transfer torque;

fLanguage

English

Journal_Title

Magnetics Letters, IEEE

Publisher

ieee

ISSN

1949-307X

Type

jour

DOI

10.1109/LMAG.2015.2392079

Filename

7008445