This book presents the theoretical and experimental investigations on antiferromagnetically coupled ferrimagnets and reveals new aspects of ferrimagnetic dynamics in terms of the role of angular momentum. The purpose of this book is to show readers that antiferromagnets/ferrimagnets are useful in spintronic devices in that (1) The non­adiabatic spin­transfer torque in antiferromagnets acts as a staggered magnetic field, which can drive the magnetic domain walls, and (2) The Gilbert damping parameter , the energy ­dissipation rate associated with the magnetic dynamics of ferrimagnets, is insensitive to temperature in contrast to the conventional understanding that the effective of ferrimagnets diverges at the angular momentum compensation temperature. This book provides readers with a scientific platform of ferrimagnetic dynamics, which serves as a useful basis for realizing the next ­generation of spintronic devices.  

Takaya Okuno received a Ph.D. in science in March 2020 from Kyoto University, where he engaged in the research of spintronics with his professor, Dr. Teruo Ono.  

1. Introduction.- 2. Spin-transfer torques for domain wall motion in antiferromagnetically-coupled ferrimagnets.- 3. Gilbert  damping  parameter  of  ferrimagnets  probed  by  domain  wall motion.- 4. Gilbert  damping  parameter  of  ferrimagnets  probed  by  magnetic resonance.- 5. Conclusion.