Understanding how spins move at pico- and femtosecond time scales is the focus of much of contemporary research in magnetism. I will go through some basic and more advanced concepts in the exciting emerging field of terahertz (THz) magnetism, where electromagnetic radiation in the 0.1-10 THz range, the so-called THz gap, is used to probe or to control spin dynamics at these time scales.
I will give an overview of the current research in THz magnetism. As illustrating examples, I will briefly discuss how low-intensity THz radiation can be used to probe the fundamentals of spin- dependent transport in the linear regime . I will then describe how intense THz fields can be used to drive coherent and incoherent ultrafast spin dynamics in nonlinear regimes, both with broadband  and narrowband radiation .
Finally, I will show some recent implementation of metamaterials  aimed at selectively enhancing the terahertz magnetic field in the near-field . I will also illustrate the design of an anti-reflection coating that allows for table-top, femtosecond pump-probe experiments in generic nanostructures surrounded by highly reflective metamaterials .
 Z. Jin et al., Nature Physics 11, 761 (2015)
 S. Bonetti et al, Physical Review Letters 117, 087205 (2016)
 Z. Wang et al., Selective THz control of magnetic order: new opportunities from superradiant undulator sources, Journal of Physics D: Applied Physics, in press (2018)
 Hou-Tong Chen et al., Terahertz Science and Technology 1, 42 (2008)
 D. Polley, et al. Journal of Physics D: Applied Physics 51, 084001 (2018)
 M. Pancaldi et al. Optics Letters 26, 2917 (2018)
Stefano Bonetti, "THz probing and manipulation of magnetism (Conference Presentation)," Proc. SPIE 10732, Spintronics XI, 107322T (Presented at SPIE Nanoscience + Engineering: August 22, 2018; Published: 18 September 2018); https://doi.org/10.1117/12.2322364.5836437160001.
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