Spin wave amplification: electron mechanisms

V.D.Lakhno. Spin wave amplification: electron mechanisms.
– Pushchino: Scientific Center of Biological Researches USSR Academy of Sciences, 1989, 77 p. ( in Russian )

 

Contents :

Title      Page
INTRODUCTION 3
PART 1.
Magnetic Susceptibility
1.1. Magnetic Susceptibility of an Antiferromagnet in the Absence of s-f Exchange 9
1.2. Landau-Lifshits Equation for an Antiferromagnet in the Presence of s-f Exchange 12
1.3. Hydrodynamic Theory of Magnetic Susceptibility in the Presence of s-f Exchange 14
1.4. Susceptibility Tensor cF (k , w): Its Properties and Applications 18
PART 2.
Exchange Amplification of Spin Waves in Magnetically Ordered Crystals
2.1. Amplification of Spin Waves in Antiferromagnets and Ferromagnets: Qualitative Differences 20
2.2. Amplification of Spin Waves in a Longitudinal Field 22
2.3. Amplification of Spin Waves in Crossed Fields 25
2.4. Attenuation of Spin Waves: Its Effects 27
2.5. Electron Heating: Its Effect 28
2.6. Antiferromagnetic Resonance in Superconducting Antiferromagnets: Specifics 29
2.7. Propagation of Sound in Conducting Magnets 30
2.8. Nonexchange Mechanisms of Spin Wave Amplification 32
PART 3.
Amplification of Spin Waves in Anisotropic Antiferromagnets: A Macroscopic Theory
3.1. Amplification of Spin Waves in an Easy Plane Antiferromagnet in a Magnetic Field Parallel to the Anisotropy Axis 35
3.2. Amplification of Spin Waves in an Easy Plane Antiferromagnet in a Magnetic Field Perpendicular to the Anisotropy Axis 39
3.3. The s-f Exchange Amplification of Spin Waves in Ferrimagnets 41
PART 4.
Magnetoplasma Effects in s-f Exchange Amplification of Spin Waves
4.1. Magnetic Susceptibility Tensor and Conductivity 44
4.2. Kinetic Approach: Its Results 45
4.3. Resonance Effects 48
PART 5.
Multiple-Carrier Theory
5.1. Two Types of Carriers 50
5.2. Amplification of Spin Waves in Crossed Fields 52
5.3. Amplification of Spin Waves in a Weak Magnetic Field 54
PART 6.
Amplification of Spin Waves in Disordered Magnets
6.1. General 56
6.2. Spin Glass in the Absence of Current Carriers 57
6.3. The s-f Exchange Mechanism for the Amplification of Spin Waves in Spin Glass 57
6.4. Use of Spin Glass for Spin Wave Amplification 59
PART 7.
Radioelectric Effect in Antiferromagnets		 62
PART 8.
Quantum Theory of Spin Wave Amplification
8.1. Hamiltonian of s-f Exchange in an Antiferromagnet 65
8.2. Spin Wave Amplification Coefficient in a Magnetic Field 67
8.3. Spin Wave Amplification Coefficient in Ultraquantum Limit 68
8.4. Amplification of Spin Waves in a Nonquantizing Field 70
CONCLUDING REMARKS 72