By Vladimir L. Safonov
This much-needed ebook addresses the ideas, 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 enhance cutting edge magnetic units, resembling recording units and sensors.
Starting with a historic evaluate of advancements within the magnon thought, and together with unique experimental effects, the writer offers tools of magnon excitation, and a number of other easy types to explain magnon gasoline. He comprises experiments on Bose-Einstein condensation of non-equilibrium magnons, in addition to numerous purposes of a magnon approach.
In brief, the point of interest is on
1) new rules of strength 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 at once with magnetic structures, this ebook offers numerous rules and analogies that may be worthwhile of their paintings and research.
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 rest of Magnons (pages 35–57):
Chapter four Microwave Pumping of Magnons (pages 59–83):
Chapter five Thermodynamic Description of Strongly Excited Magnon method (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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Additional info for Nonequilibrium Magnons: Theory, Experiment, and Applications
In this section we shall consider an example of the microscopic approach. 1 Magnons in a Two-Sublattice Antiferromagnet An overwhelming majority of magnetic systems are antiferromagnets. The local ﬁelds in an antiferromagnetic lattice almost compensate for each other. Thus this form of magnetic order signiﬁcantly differs from the ferromagnetic order, where the local exchange ﬁeld dominates. Small spin deviations in the antiferromagnet create substantial change of local ﬁelds and cause a strong response of the whole spin system.
Is the number of magnetoelastic modes. Experimentally studied the eigenmode with the minimal wave vector π/d (minimal eigenfrequency), is most strongly coupled to the alternating magnetic ﬁeld. 105) where τ m 1 D η f0 is the inverse lifetime of the quasi ferromagnons with small k. 6 shows the dependencies of the inverse lifetime of magnetoelastic oscillation on the static magnetic ﬁeld. A strong ﬁeld dependence of τ ph1 indicates that the damping of magnetoelastic waves in all temperature ranges is due to a fast-relaxing magnetic subsystem in the region of small ﬁelds.
7 eV, which is typical for ferromagnetic metals . Patton et al. 4). 4). For the perpendicular case (black circles) the linear dependence is valid just for high FMR frequencies ω 0 /2π > 8 GHz and it is saturated at smaller frequencies. D. McMichael, private communication) show similar results except that for the ﬁeld perpendicular to the ﬁlm plane the saturation region occurs only at extremely small frequencies (ω 0 /2π < 2 GHz). 4 FMR linewidth versus frequency dependence at room temperature .
Nonequilibrium Magnons: Theory, Experiment, and Applications by Vladimir L. Safonov