Subcycle observation of terahertz-driven minimally dissipative spin switching

Abstract

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Calibration of terahertz sampling detectors for intense unipolar picosecond current pulses in waveguides

“…Nowadays though, enough solutions exist so that the interest on the use of THz has raised in many fields. Notably, the field of spintronics, conventionally limited to the sub-GHz, GHz and optical regimes for a long time, is now overtaken by THz studies where unexpected dynamics [1][2][3][4][5] and resonant modes have been observed [6][7][8] . Some of these works, particularly when dealing with magnetization manipulation, require high fluence THz pulses, preferably of unipolar character.…”

Optically Gated Terahertz-Field-Driven Switching of Antiferromagnetic CuMnAs

“…14 Finally, (iii) robust retention of information is guaranteed because of the negligible impact of high magnetic fields up to 60 T. 15,16 The last feature also poses a challenge because very strong magnetic fields may be required to switch the AFM order 17 . However, recent theoretical 18 and experimental works paved the way to the manipulation of the AFM order 19 by electrical currents in inversion-asymmetric AFM materials such as CuMnAs 20,21,22,23 and Mn2Au 24,25 . Charge-current pulses were shown to reproducibly switch CuMnAs devices (such as in Fig.…”