Nonlinear magnetization dynamics of antiferromagnetic spin resonance induced by intense terahertz magnetic field

Mukai, Yosuke; Hirori, Hideki; Yamamoto, Takafumi; Kageyama, Hiroshi; Tanaka, Kazuyoshi

doi:10.1088/1367-2630/18/1/013045

Cited by 77 publications

(60 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a damped oscillation, one would then expect a time dependence of the instantaneous magnon frequency, which may cause intriguing nonlinearities [39]. Such effects, however, are not seen in our experiment.…”

mentioning

confidence: 63%

Terahertz-Driven Nonlinear Spin Response of Antiferromagnetic Nickel Oxide

Mentink²,

et al. 2016

View full text Add to dashboard Cite

Terahertz magnetic fields with amplitudes of up to 0.4 Tesla drive magnon resonances in nickel oxide while the induced dynamics is recorded by femtosecond magneto-optical probing. We observe distinct spin-mediated optical nonlinearities, including oscillations at the second harmonic of the 1 THz magnon mode. The latter originate from coherent dynamics of the longitudinal component of the antiferromagnetic order parameter, which are probed by magneto-optical effects of second order in the spin deflection. These observations allow us to dynamically disentangle electronic from lattice-related contributions to magnetic linear birefringence and dichroism-information so far only accessible by ultrafast THz spin control. The nonlinearities discussed here foreshadow physics that will become essential in future subcycle spin switching.

show abstract

mentioning

confidence: 63%

Terahertz-Driven Nonlinear Spin Response of Antiferromagnetic Nickel Oxide

Mentink²,

et al. 2016

View full text Add to dashboard Cite

show abstract

“…[165,166] By comparing optically driven with THz-driven alignment, it was determined whether or whether not rotational molecular degrees of freedom make a dominant contribution to the dielectric function of polar solvents such as methanol. [168,169] Finally, by using intense THz magnetic and electric fields, nonlinear magnetic responses of magnetically ordered solids were observed, thereby providing insights into the underlying effective spin Hamiltonian, [173] the relative impact of electric and magnetic field component of the THz pulse, [174] and the magnetooptic probing mechanism. [171,172] Analysis of the reemitted THz field often allows one to reconstruct the dynamics of the THz-induced current, thereby providing important information on the mechanism from which it arises.…”

Section: Properties Of Driven Modesmentioning

confidence: 99%

Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

284

147

View full text Add to dashboard Cite

reason for this interest relies on the fact that THz radiation can couple resonantly to numerous fundamental motions of ions, electrons, and electron spins in all phases of matter. For example, in solids, the THz range overlaps with the frequency of lattice vibrations (phonons), the collision rates of conduction electrons, the binding energy of bound electron-hole pairs (excitons), and the precession frequency of spin waves (magnons). Consequently, THz radiation, both continuous-wave and pulsed, has been used for characterization of and gaining insight into elementary processes in complex materials. The majority of these studies used relatively weak THz fields and, thus, probed the linear response of the material, without inducing notable material modifications.Only recently, however, completely new avenues in THz science were opened up by triggering nonlinear THz responses of materials. [3][4][5][6][7][8][9][10][11][12][13] Instead of using weak fields to primarily observe selected THz modes such as phonons or magnons, strong fields allow one to actively drive them to unprecedentedly large amplitudes, potentially thereby resulting in novel states of matter. [6,8,11] For example, simulations suggest that exciting matter with intense THz transients may lead to massive modifications of electrically [14] or magnetically [15] ordered domains and enable the acceleration of free ions to ≈1 MeV, [16] and postacceleration to 50-100 MeV energies. [17] Remarkable experimental results such as switching of magnetic order, [18,19] parametric amplification of optical phonons, [20] novel insights into spin-lattice coupling, [21,22] and acceleration of free electrons in a THz linear accelerator [23] were achieved only recently. This progress has been made possible by the development of laser-driven table-top THz sources routinely providing pulses with unprecedented energies and peak electric and magnetic field strengths throughout the entire THz spectral range. Different laser-based THz pulse generation techniques can be used to access different parts of the spectral range extending from 0.1 to 10 THz. Some of the recently developed technologies enable the generation of radiation with even larger bandwidth or tuning range up to 100 THz and beyond, which lead to an extension of what is called the THz spectral range. An overview of the approximate spectral coverage and the achieved highest pulse energies and peak electric-field strengths of various laserdriven technologies is given in Figure 1. ScopeIn this work, the basic principles of femtosecond-laser-driven intense pulsed THz sources and their recent development are reviewed. These sources are capable of delivering peak electric field strengths on the MV cm −1 scale. Corresponding typical THz pulse energies are on the µJ-to-mJ level, depending on A review on the recent development of intense laser-driven terahertz (THz) sources is provided here. The technologies discussed include various types of sources based on optical rectification (OR), spintronic emitters, and laserfilame...

show abstract

“…Therefore, optical control of the antiferromagnets have been intensively investigated in the past few decades 2 . Nonlinear interaction with THz magnetic field has been also studied 3 , which leads to direct spin manipulation for future data processing in nonvolatile memory devices. Readout of the magnetization information in antiferromagnets is, however, still very difficult since they are generally not sensitive to external field because of the much smaller net magnetization than in ferromagnets, which has made their practical application challenging.…”

Section: Main Textmentioning

confidence: 99%

Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films

et al. 2020

View full text Add to dashboard Cite

Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however their smaller responses to external field inhibit device application.Recently the noncollinear antiferromagnet Mn3Sn, a Weyl semimetal candidate, was reported to show large anomalous Hall effect (AHE) at room temperature comparable to ferromagnets.Dynamical aspect of such large responses is an important issue to be clarified for future THz data processing. Here the THz anomalous Hall conductivity in Mn3Sn thin films is investigated

show abstract

Nonlinear magnetization dynamics of antiferromagnetic spin resonance induced by intense terahertz magnetic field

Cited by 77 publications

References 41 publications

Terahertz-Driven Nonlinear Spin Response of Antiferromagnetic Nickel Oxide

Terahertz-Driven Nonlinear Spin Response of Antiferromagnetic Nickel Oxide

Laser‐Driven Strong‐Field Terahertz Sources

Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films

Contact Info

Product

Resources

About