An analytical computation of magnetic field generated from a cylinder ferromagnet

Abstract

An analytical formulation to compute a magnetic field generated from an uniformly magnetized cylinder ferromagnet is developed. Exact solutions of the magnetic field generated from the magnetization pointing in an arbitrary direction are derived, which are applicable both inside and outside the ferromagnet. The validities of the present formulas are confirmed by comparing them with demagnetization coefficients estimated in earlier works. The results will be useful for designing practical applications, such as high-density magnetic recording and microwave generators, where nanostructured ferromagnets are coupled to each other through the dipole interactions and show cooperative phenomena such as synchronization. As an example, the magnetic field generated from a spin torque oscillator for magnetic recording based on microwave assisted magnetization reversal is studied.

published

References in corpus (9)

• Phase locking dynamics of dipolarly coupled vortex-based spin transfer oscillators
• Magnetization reversal condition for a nanomagnet within a rotating magnetic field
• Optimizing magneto-dipolar interactions for synchronizing vortex based spin-torque nano-oscillators
• Instability analysis of spin torque oscillator with an in-plane magnetized free layer and a perpendicularly magnetized pinned layer
• Magnetization switching by current and microwaves
• Magnetization switching by microwaves synchronized in the vicinity of precession frequency
• Linewidth of Power Spectrum Originated from Thermal Noise in Spin Torque Oscillator
• Magnetization switching by microwaves initially rotating in opposite direction to precession
• Crossover between fast and slow excitation of magnetization by spin torque

Cited by in corpus (6)

• Double Free-Layer Magnetic Tunnel Junctions for Probabilistic Bits
• Inducing out-of-plane precession of magnetization for microwave assisted magnetic recording using an oscillating polarizer in spin torque oscillator
• Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers
• Full analytical solution for the magnetic field of uniformly magnetized cylinder tiles
• Computational capability for physical reservoir computing using a spin-torque oscillator with two free layers
• Stray magnetic fields from elliptical-shaped and stadium-shaped ferromagnets