Intrinsic energy flow in laser-excited 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>3</mml:mn><mml:mi>d</mml:mi></mml:math>
 ferromagnets

Zahn, Daniela; Jakobs, Florian; Seiler, H.; Butcher, Tim A.; Engel, Dieter; Vorberger, Jan; Atxitia, Unai; Windsor, Yoav William; Ernstorfer, Ralph

doi:10.1103/physrevresearch.4.013104

Cited by 14 publications

(16 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the initial state is a solid, the lattice is heated due to electron–phonon energy transfer to a new thermal equilibrium over several (tens to hundreds of) picoseconds. During this evolution, many interesting effects such as the ultrafast electron and non-equilibrium phonon dynamics [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ], changes in lattice stability [ 20 , 21 , 22 , 23 , 24 ], phase transitions [ 25 , 26 , 27 , 28 , 29 , 30 ], and non-equilibrium electron–phonon interactions [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ] take place. It should be pointed out that these various physical processes are all driven by electronic excitations.…”

Section: Introductionmentioning

confidence: 99%

“…Instead, it becomes necessary in aluminum to separately account for the partial electron–phonon coupling to investigate the energy flow evolution. However, it seems the findings in aluminum cannot be generalized easily as further femtosecond electron diffraction experiments show different results [ 39 , 40 , 43 ]. Thus, accurate electron–phonon coupling factors for a wide variety of elements and materials are in high demand.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, a large number of theoretical calculations for this important physical quantity have been implemented under different methods for various metals [ 32 , 33 , 39 , 40 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ]. Nonetheless, from very low electron temperatures(∼300 K) to very high electron temperature (>2000 K), different models provide estimations varying by a factor of two at the least and up to an order of magnitude [ 49 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

et al. 2022

Self Cite

View full text Add to dashboard Cite

The rate of energy transfer between electrons and phonons is investigated by a first-principles framework for electron temperatures up to Te = 50,000 K while considering the lattice at ground state. Two typical but differently complex metals are investigated: aluminum and copper. In order to reasonably take the electronic excitation effect into account, we adopt finite temperature density functional theory and linear response to determine the electron temperature-dependent Eliashberg function and electron density of states. Of the three branch-dependent electron–phonon coupling strengths, the longitudinal acoustic mode plays a dominant role in the electron–phonon coupling for aluminum for all temperatures considered here, but for copper it only dominates above an electron temperature of Te = 40,000 K. The second moment of the Eliashberg function and the electron phonon coupling constant at room temperature Te=315 K show good agreement with other results. For increasing electron temperatures, we show the limits of the T=0 approximation for the Eliashberg function. Our present work provides a rich perspective on the phonon dynamics and this will help to improve insight into the underlying mechanism of energy flow in ultra-fast laser–metal interaction.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, even though such models can qualitatively well describe experimental ultrafast magnetic order dynamics [2,3,4,5,6,7,8,9,10,13] our results indicate the quantitative comparison needs to be met with caution, in particular if not all experimental parameters are well known. Our data can serve as a test case for more microscopic descriptions such as atomistic spin models [14,38] or time-dependent density functional theory [39,40] that go beyond a mean-field description and can potentially include such effects.…”

Section: Fluence Dependence Of the Ultrafast Magnetic Order Dynamicsmentioning

confidence: 99%

Robust magnetic order upon ultrafast excitation of an antiferromagnet

Lee¹,

Windsor²,

Fedorov³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

antiferromagnetic order dynamics exhibit two-step demagnetization behaviors with two similar timescales (<1 ps, ∼10 ps), indicating a strong exchange coupling between localized 4f and itinerant conduction electrons. Despite a good qualitative agreement, the M3TM predicts larger demagnetization than our experimental observation, which can be phenomenologically described by a transient, fluence-dependent increased Néel temperature. Our results indicate that effects beyond a mean-field description have to be considered for a quantitative description of ultrafast magnetic order dynamics.

show abstract

“…This is particularly important if not all experimental parameters, such as the electron and/or lattice temperature evolution are accessible under similar conditions as the magnetization dynamics. Our data can serve as a test case for more microscopic descriptions such as atomistic spin models [14,42] or time-dependent density functional theory [43,44] that go beyond a mean-field description and can potentially include such effects.…”

Section: Fluence Dependence Of the Ultrafast Magnetic Order Dynamicsmentioning

confidence: 99%

Robust Magnetic Order Upon Ultrafast Excitation of an Antiferromagnet

Lee

Windsor

Fedorov

et al. 2022

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

The ultrafast manipulation of magnetic order due to optical excitation is governed by the intricate flow of energy and momentum between the electron, lattice, and spin subsystems. While various models are commonly employed to describe these dynamics, a prominent example being the microscopic three temperature model (M3TM), systematic, quantitative comparisons to both the dynamics of energy flow and magnetic order are scarce. Here, an M3TM was applied to the ultrafast magnetic order dynamics of the layered antiferromagnet GdRh2Si2. The femtosecond dynamics of electronic temperature, surface ferromagnetic order, and bulk antiferromagnetic order were explored at various pump fluences employing time‐ and angle‐resolved photoemission spectroscopy and time‐resolved resonant magnetic soft X‐ray diffraction, respectively. After optical excitation, both the surface ferromagnetic order and the bulk antiferromagnetic order dynamics exhibit two‐step demagnetization behaviors with two similar timescales (<1 ps, ∼10 ps), indicating a strong exchange coupling between localized 4f and itinerant conduction electrons. Despite a good qualitative agreement, the M3TM predicts larger demagnetization than the experimental observation, which can be phenomenologically described by a transient, fluence‐dependent increased Néel temperature. The results indicate that effects beyond a mean‐field description have to be considered for a quantitative description of ultrafast magnetic order dynamics.

show abstract

Intrinsic energy flow in laser-excited 3d ferromagnets

Cited by 14 publications

References 59 publications

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

Robust magnetic order upon ultrafast excitation of an antiferromagnet

Robust Magnetic Order Upon Ultrafast Excitation of an Antiferromagnet

Contact Info

Product

Resources

About