Download Nonequilibrium Magnons: Theory, Experiment, and Applications by Vladimir L. Safonov PDF

By Vladimir L. Safonov

This much-needed e-book addresses the options, types, experiments and functions of magnons and spin wave in magnetic units. It fills the distance within the present literature by means of supplying the theoretical and technological framework had to strengthen leading edge magnetic units, reminiscent of recording units and sensors.

Starting with a historic evaluation of advancements within the magnon notion, and together with unique experimental effects, the writer provides tools of magnon excitation, and a number of other simple types to explain magnon gasoline. He contains experiments on Bose-Einstein condensation of non-equilibrium magnons, in addition to a number of purposes of a magnon approach.

In brief, the focal point is on

1)  new rules of power transformation from noise to a coherent oscillations (chapters 5,6, appendix G)

2) new approach to computing  - bankruptcy 8.

Suitable if you happen to don't paintings without delay with magnetic structures, this booklet delivers numerous principles and analogies that may be worthy of their paintings and research.

Content:
Chapter 1 Harmonic Oscillators and the common Language of technology (pages 1–11):
Chapter 2 Magnons in Ferromagnets and Antiferromagnets (pages 13–33):
Chapter three leisure of Magnons (pages 35–57):
Chapter four Microwave Pumping of Magnons (pages 59–83):
Chapter five Thermodynamic Description of Strongly Excited Magnon procedure (pages 85–101):
Chapter 6 Bose–Einstein Condensation of Quasi Equilibrium Magnons (pages 103–118):
Chapter 7 Magnons in an Ultrathin movie (pages 119–129):
Chapter eight Collective Magnetic Dynamics in Nanoparticles (pages 131–141):

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Extra info for Nonequilibrium Magnons: Theory, Experiment, and Applications

Sample text

100) This formula has a simple physical meaning that the damping η 1 of the initial pure oscillation of the frequency ω 1 is “transferred” to the damping ηQ 2 of a new normal mode of the frequency ω Q 2. 1 Example 1: Nuclear Magnons As an example, we shall consider nuclear magnons in an antiferromagnet. Nuclear magnons, which appear as a result of coupled oscillations of quasi-ferromagnetic magnons (ω fk ) and Larmor nuclear spins precession (ω n ), represent a good candidate to check the validity of the “transferred” damping.

4 Ferromagnetic Resonance Linewidth FMR linewidth measurements have been widely utilized to determine the relaxation rate for low-level linear excitations (for example [56, 57]). In this section we will use the relaxation rates for microscopic mechanisms evaluated in previous sections to analyze a set of FMR data in soft thin films (NiFe, permalloy). 4 Ferromagnetic Resonance Linewidth for all microscopic processes. Usually in FMR experiments, the field swept linewidth ΔH is measured. 42) γ 2 (H x C H y ) @ω 0 D .

It has rhombohedral crystalline symmetry with the C3 -axis perpendicular to the “easy plane” and exhibits strong magnetoelastic dynamics. The magnetic moments of quasi phonons in this crystal have been studied in [43]. Later, in Chapter 4 we will focus on the transverse quasi phonons (with the wave vectors in the C3 direction and polarization parallel to the static magnetic field), which are the most strongly coupled to the quasi-ferromagnetic magnons. 4) can be written as Ä ω k D ce k 1 (H Δme ξ )2 2 H(H C HDM ) C H Δme C (α k)2 1/2 .

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