Spatially inhomogeneous ultrafast precessional magnetization reversal
Abstract
Spatially resolved measurements of quasiballistic precessional magnetic switching in a microstructure are presented. A technique is introduced to suppress remanent end domains and allow a completely uniform, almost-perfect-macrospin initial state. Though the precessional response to a transverse magnetic field pulse is initially spatially uniform, and macrospin characteristics can be emulated, dephasing still occurs leading to nonuniformity and transient demagnetization. These nonuniformities are intensified when using coincident longitudinal and transverse pulses created by crossing current wires. The results have implications for the reliability of ballistic precessional switching in magnetic devices.
- Publication:
-
Physical Review B
- Pub Date:
- July 2003
- DOI:
- 10.1103/PhysRevB.68.020402
- arXiv:
- arXiv:cond-mat/0212089
- Bibcode:
- 2003PhRvB..68b0402H
- Keywords:
-
- 75.60.Jk;
- 76.50.+g;
- 78.47.+p;
- 85.70.Kh;
- Magnetization reversal mechanisms;
- Ferromagnetic antiferromagnetic and ferrimagnetic resonances;
- spin-wave resonance;
- Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter;
- Magnetic thin film devices: magnetic heads;
- domain-motion devices etc.;
- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 17 pages (including 4 figures), submitted to Phys. Rev. Lett