Dual-pump manipulation of ultrafast demagnetization in TbFeCo

Cheng, Tuyuan; Wu, Jing; Liu, Tao; Zou, Xu; Cai, Jianwang; Chantrell, R.W.; Xu, Yongbing

doi:10.1103/physrevb.93.064401

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…Since the electron–spin interaction channel is open here, within few femtoseconds, the temperature of the spin system increases to a higher value, following the sharp rise of electron temperature. Figure b shows that the reflectivity peak increases linearly with the increase in pump fluence, which is directly related to the electron temperature . The pump laser-excited hot electrons interact with the spin system via transfer of energy.…”

Section: Results and Discussionmentioning

confidence: 94%

Ultrafast Spin Dynamics of Electrochemically Grown Heusler Alloy Films

Karim¹,

Adhikari

Panda

et al. 2021

J. Phys. Chem. C

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The electrochemical growth of Heusler alloy film with good morphological quality and crystalline order using singlecrystalline substrate is demonstrated. Static magneto optical Kerr effect studies are employed to reveal the surface magnetization reversal of the films. An understanding of the intrinsic nature of the magnetization dynamics in this class of electrochemically grown materials is presented using time-resolved magneto optical Kerr effect measurements, under femtosecond laser excitation. Excitation laser fluence dependence study reveals the ultrafast demagnetization time, fast remagnetization time, and magnetic damping parameter as well as their correlation.

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Section: Results and Discussionmentioning

confidence: 94%

Ultrafast Spin Dynamics of Electrochemically Grown Heusler Alloy Films

Karim¹,

Adhikari

Panda

et al. 2021

J. Phys. Chem. C

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“…TbFeCo is an example of such a material, that, due to large coercive fields above 10 T, is well suitable for high density magnetic recording [28,29]. Although several attempts of modeling the laser-induced spin dynamics in TbFeCo have been performed [30][31][32], not only spin dynamics, but even the static spin structure of unperturbed TbFeCo are poorly understood. Moreover, experimental studies of high-coercive-field materials are seriously hampered by the need for even higher magnetic fields and thus require unique experimental installations.…”

Section: Introductionmentioning

confidence: 99%

High-field anomalies of equilibrium and ultrafast magnetism in rare-earth–transition-metal ferrimagnets

et al. 2019

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Magneto-optical spectroscopy in fields up to 30 Tesla reveals anomalies in the equilibrium and ultrafast magnetic properties of the ferrimagnetic rare-earth-transition metal alloy TbFeCo. In particular, in the vicinity of the magnetization compensation temperature, each of the magnetizations of the antiferromagnetically coupled Tb and FeCo sublattices show triple hysteresis loops. Contrary to state-of-the-art theory, which explains such loops by sample inhomogeneities, here we show that they are an intrinsic property of the rare-earth ferrimagnets. Assuming that the rare-earth ions are paramagnetic and have a non-zero orbital momentum in the ground state and, therefore, a large magnetic anisotropy, we are able to reproduce the experimentally observed behavior in equilibrium. The same theory is also able to describe the experimentally observed critical slowdown of the spin dynamics in the vicinity of the magnetization compensation temperature, emphasizing the role played by the orbital momentum in static and ultrafast magnetism of ferrimagnets.

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“…HD-AOS induced by LP and CP pulse pairs with different power combinations at a fixed delay time, 1.6 ps, between them were investigated first. The energy transfer for the electron-spin system to the lattice system is mediated by the phonons, which takes about 1.6 ps to reach the spinelectron-lattice thermal equilibrium state [30][31][32] with the system in a largely demagnetized state when the second CP pulse arrives. Figure 4a shows each subtracted MOKE image centered along the scanning path of the dual-pump beam with a field of view of 60 lm Â 380 lm.…”

Section: Resultsmentioning

confidence: 99%

Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching

Zheng²,

Wang³

et al. 2022

Rare Met.

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The heating and helicity effects induced by circularly polarized laser excitation are entangled in the helicity-dependent all-optical switching (HD-AOS), which hinders understanding the magnetization dynamics involved. Here, applying a dual-pump laser excitation, first with a linearly polarized (LP) laser pulse followed by a circularly polarized (CP) laser pulse, the timescales and contribution from heating and helicity effects in HD-AOS were identified with a Pt/Co/Pt triple-layer. When the LP laser pulses preheat the sample to a nearly fully demagnetized state, the CP laser pulses with a power reduced by 80% switch the sample’s magnetization. By varying the time delay between the two pump pulses, the results show that the helicity effect, which gives rise to the deterministic helicity-induced switching, arises almost instantly within 200 fs close to the pulse width upon laser excitation. The results reveal that the transient magnetization state upon which CP laser pulses impinge is the key factor for achieving HD-AOS, and importantly, the tunability between heating and helicity effects with the unique dual-pump laser excitation approach will enable HD-AOS in a wide range of magnetic material systems having wide-ranging implications for potential ultrafast spintronics applications. Graphical abstract

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Dual-pump manipulation of ultrafast demagnetization in TbFeCo

Cited by 14 publications

References 21 publications

Ultrafast Spin Dynamics of Electrochemically Grown Heusler Alloy Films

Ultrafast Spin Dynamics of Electrochemically Grown Heusler Alloy Films

High-field anomalies of equilibrium and ultrafast magnetism in rare-earth–transition-metal ferrimagnets

Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching

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