Subpicosecond magnetization dynamics in TbCo alloys

Conditions for thermally induced all-optical switching in ferrimagnetic alloys: Modeling of TbCo

“…Most of the experimental studies on TbCo have been subject to switching through the use of circularly polarized laser pulses [7,17,20] that confirmed the occurrence of AOS in TbCo, but mainly the inverse-Faraday effect has been speculated as the mechanism. In a recent experiment on TbCo [7,18], with a single laser pulse, TIMS has not been confirmed, and only thermal demagnetization with subsequent formation of domains has been reported. Due to the fact that different experiments are performed in different conditions, i.e., different pulse lengths, fluences, static vs timeresolved probing, single-shot vs multiple shot laser pulses, and others, they cannot be considered as conclusive at this point and the possibility of TIMS in TbCo is an open question.…”

“…However, there have also been a number of demonstrations of AOS in other ferrimagnets [17,18], ferromagnets [19], and multilayer combinations [20][21][22]. In some material systems a single pulse mechanism has been demonstrated [11], while in others multiple pulses have been shown to be required [7].…”

“…While GdFeCo has been the subject of many theoretical studies, TbCo has been so far mostly investigated experimentally [7,17,18,20], motivating the need for a theoretical investigation of switching. Apart from experimental reports [29,30] on AOS, TbFe has also been modeled atomistically, though mostly from the point of view of static magnetization [31].…”

“…In the single subpicosecond pulse mechanism the first two requirements have so far been unambiguously demonstrated. However, also rather long laser pulses have been used to drive magnetization reversal, up to 10 ps [18], raising fundamental questions about the intrinsic or limiting time scales of the underlying processes.…”

Novel behaviors of anomalous Hall effect in TbFeCo ferrimagnetic thin films

“…26 Moreover, MOKE signal in all-optical switching changes with accordance to the Tb composition, which is similar behavior as these experimental results, although the wavelength selectively detect different moment of RE or TM-site. 27 The measured hysteresis has the sum of the opposite sign AHE. If the two phase model is adequate, the AHE will be measured as the sum of RE-rich and TM-rich phases.…”