Role of electron and phonon temperatures in the helicity-independent all-optical switching of GdFeCo

Gorchon, Jon; Wilson, R. B.; Yang, Yang; Pattabi, Akshay; Chen, Junyang; He, Lenian; Wang, J. P.; Li, Mo; Bokor, Jeffrey

doi:10.1103/physrevb.94.184406

Cited by 81 publications

(107 citation statements)

References 37 publications

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“…However, while we have demonstrated that T M is not an essential criteria for switching, the results so far do not confirm that it is an irrelevant parameter in the occurrence of AOS. In fact, since we clearly observe that the composition Tb 16 Co 84 required more laser energy to switch, the presence of T M influences the switching process. Furthermore, the composition with a compensation temperature higher than room temperature (crossed by the electronic temperature under the action of the laser pulse), i.e., Tb 24 Co 76 , is the only one that undergoes switching for all laser pulse durations.…”

Section: Resultsmentioning

confidence: 97%

“…[18]. The choice of compositions corresponds to Tb 16 Co 84 ( ) with T M <T room ,Tb 24 Co 76 with T M >T room ( ), and Tb 32 Co 68 ( ) without a compensation point. The pump fluence in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Our simulations show that the composition Tb 12 Co 88 , also without a compensation temperature, presents TIMS as well. Furthermore, for the 50 fs laser pulse duration, the range for TIMS also includes Tb 16 Co 84 ,forwhichT M is below T room . Thus, going through this point is also not a necessary condition for the AOS.…”

Section: Resultsmentioning

confidence: 99%

“…A large amount of work in the area of AOS has been carried out in the prototypical disordered ferrimagnetic alloy GdFeCo of various compositions, using laser pulses in the regime from tens of femtoseconds, see, e.g., [6,[11][12][13][14], and up to picoseconds [15,16]. However, there have also been a number of demonstrations of AOS in other ferrimagnets [17,18], ferromagnets [19], and multilayer combinations [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…In a number of recent experiments [1][2][3][4][5][6][7][8] , it has been shown that femtosecond laser pulses can control magnetization on picosecond timescales, which is at least an order of magnitude faster compared to conventional magnetization dynamics. Among these demonstrations, the material system, GdFeCo ferrimagnetic films, is particularly interesting because deterministic toggleswitching of the magnetic order is possible without any external magnetic field.…”

Section: Main Textmentioning

confidence: 99%

Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers

Gorchon

Lambert

Yang

et al. 2017

Applied Physics Letters

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A single femto-second optical pulse can fully reverse the magnetization of a film within picoseconds. Such fast operation hugely increases the range of application of magnetic devices. However, so far, this type of ultrafast switching has been restricted to ferri-magnetic GdFeCo films. In contrast, all optical switching of ferro-magnetic films require multiple pulses, thereby being slower and less energy efficient. Here, we demonstrate magnetization switching induced by a single laser pulse in various ferromagnetic Co/Pt multilayers grown on GdFeCo, by exploiting the exchange coupling between the two magnetic films. Table-top picoseconds. This coupling approach will allow ultrafast control of a variety of magnetic films, critical for applications.

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Single‐Shot Multi‐Level All‐Optical Magnetization Switching Mediated by Spin Transport

Iihama

Deb

et al. 2018

Advanced Materials

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for GdFeCo-based materials. The AO-HIS has been described by a thermal-driven switching mechanism attributed to the transient ferromagnetic-like states and the transfer of angular momentum between Gd sub-lattice and FeCo sub-lattice. [2,3,[17][18][19][20] Very recently, this type of switching has not only been observed in the case of light pulses, but also for electron pulses. [7][8][9] In contrast to AO-HIS, in the case of alloptical helicity-dependent switching (AO-HDS), the final state of magnetization is determined by the circular polarization of the light. AO-HDS has been observed for a large variety of magnetic materials such as ferrimagnetic alloy, ferrimagnetic multilayer, ferromagnet thin films, and granular recording media. [4,5,[10][11][12][13][14][15] However, so far, multiple pulses are necessary to fully deterministically switch the magnetization for AO-HDS. [10,16] The use of singlepulse switching would be interesting because it is ultrafast and energy-efficient, however, restriction to Gd-based materials limit potential spintronic devices application. Furthermore, in order to move towards ultrafast-spintronic applications, one needs to study and understand the fundamental mechanism not only for single layers, as it has been done in most study so far, but also in more complex structures like spin-valve structures, a key building block of modern spintronics. Selective magnetization switching in spin-valve structures or more complex heterostructures will enable multi-level magnetic storage and memories. [21][22][23] Here, we demonstrate that the four possible magnetic configurations of a magnetic spin-valve structure ([Co/Pt]/Cu/GdFeCo), shown schematically in Figure 1 where both layers are magnetically decoupled, can be accessed using a sequence of single fs light pulses. We show that a single laser pulse is able to switch the magnetization of either the GdFeCo layer alone or the magnetizations of both GdFeCo and [Co/Pt] layers, depending on the optical pulse intensity. We attribute this magnetic configuration control of the multilayer to, in part, a result of the ultrafast magnetization dynamics in spin-valve structure as well as ultrafast non-local transfer of angular momentum between layers. [24][25][26][27][28][29] Indeed, ultrafast quenching of magnetization in ferromagnetic or ferrimagnetic layers creates spin-polarized currents that propagate in the metallic spacer layer and transfer the angular momentum to the other magnetic layer. We believe the switching of the [Co/Pt] layer results from a combination of optical excitation and the All-optical ultrafast magnetization switching in magnetic material thin film without the assistance of an applied external magnetic field is explored for future ultrafast and energy-efficient magnetic storage and memories. It is shown that femtosecond (fs) light pulses induce magnetization reversal in a large variety of magnetic materials. However, so far, only GdFeCo-based ferrimagnetic thin films exhibit magnetization switching via a single optical pulse. Here,...

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Role of electron and phonon temperatures in the helicity-independent all-optical switching of GdFeCo

Cited by 81 publications

References 37 publications

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

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

Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers

Single‐Shot Multi‐Level All‐Optical Magnetization Switching Mediated by Spin Transport

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