Spin Wave Excitations of a Magnetic Pillar With Dipolar Coupling Between the Layers (Preprint)
Abstract
It is demonstrated analytically that the spectrum of small-amplitude spatially uniform magnetization excitations in an in-plane magnetized magnetic pillar with two ferromagnetic layers coupled by dipole-dipole interaction can be approximately described by the traditional Kittel's formula with reduced saturation magnetization and effective anisotropy field. The spectrum consists of a quasi-symmetric and a quasi-antisymmetric modes, and the apparent reduction of saturation magnetization for the quasi-symmetric mode (smaller or equal to 50 %) is much larger than for the quasi-antisymmetric mode (smaller or equal to 10 %). This effect of dynamic dipolar coupling between the nano-pillar layers could be partly responsible for the apparent reduction of static magnetization seen in many spin-torque experiments performed on magnetic nano-pillars.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 2009
- Accession Number
- ADA510696
Entities
People
- A. Slavin
- Elena Bankowski
- O. Dmytriiev
- T. Meitzler
- V. Tiberkevich
Organizations
- Oakland University