Nonequilibrium Magnetization Dynamics of Nickel [Phys. Rev. Lett. 78, 4861 (1997)]

Hohlfeld, J.; Matthias, E.; Knorren, R.

doi:10.1103/physrevlett.79.960

Cited by 25 publications

(97 citation statements)

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“…The results showed that after a laser pulse, the magnetization responds within the first picosecond leading to a sharp demagnetization and a much longer remagnetization time. These dynamics have been observed by other experimental groups 5,6 but the theoretical understanding of the dynamics is still limited. Improving this understanding could pave the way for magnetic storage devices with operating speeds much faster than those of present devices.…”

Section: Introductionmentioning

confidence: 86%

Classical spin model of the relaxation dynamics of rare-earth doped permalloy

2012

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Section: Introductionmentioning

confidence: 86%

Classical spin model of the relaxation dynamics of rare-earth doped permalloy

2012

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“…It has recently been observed that ferromagnetic nickel may partially demagnetize on time scales much shorter than the spin-lattice relaxation time [1][2][3][4] following excitation by femtosecond optical pulses. The first experimental observations revealed demagnetization times of 260 fs 1 and 280 fs, 2 while a theoretical study suggested an intrinsic time scale for demagnetization of just 10 fs.…”

Section: School Of Physics University Of Exeter Stocker Road Exetementioning

confidence: 99%

Investigation of ultrafast spin dynamics in a Ni thin film

Wilks

Hughes

Hicken

2002

Journal of Applied Physics

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Enhancement of spin wave excitation by spin currents due to thermal gradient and spin pumping in yttrium iron garnet/Pt Appl. Phys. Lett. 102, 012401 (2013) Dynamics of the vortex core in magnetic nanodisks with a ring of magnetic impurities Appl. Phys. Lett. 101, 252402 (2012) Evidence of metastability near the Curie temperature of polycrystalline gadolinium J. Appl. Phys. 112, 113913 (2012) Direct imaging of phase relation in a pair of coupled vortex oscillators AIP Advances 2, 042180 (2012) Transition in spin dependent transport from superparamagnetic-superparamagnetic to superparamagneticferromagnetic in sputtered Cu100-xCox granular films

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“…They reported that the magnetization of a 22 nm thick film drops rapidly during the first picosecond and reaches its minimum after 2 ps. Recently, by time-resolved second harmonic generation (SHG), Hohlfeld et al [3] found that even when electrons and lattice have not reached a common thermal equilibrium, the classical M (T ) curve can be reproduced for delay times longer than the electron thermalization time of about 280 fs. On the other hand, the transient magnetization reaches its minimum ≈ 50 fs before electron thermalization.…”

mentioning

confidence: 99%

“…On the other hand, the transient magnetization reaches its minimum ≈ 50 fs before electron thermalization. Both groups used polycrystalline Ni but different pulse durations: 60 fs [2] vs 150 fs [3]. Recently even faster spin decays have been observed [4].…”

mentioning

confidence: 99%

Ultrafast spin dynamics in nickel

Hübner

Zhang

1998

Phys. Rev. B

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The spin dynamics in Ni is studied by an exact diagonalization method on the ultrafast time scale. It is shown that the femtosecond relaxation of the magneto-optical response results from exchange interaction and spin-orbit coupling. Each of the two mechanisms affects the relaxation process differently. We find that the intrinsic spin dynamics occurs during about 10 fs while extrinsic effects such as laser-pulse duration and spectral width can slow down the observed dynamics considerably. Thus, our theory indicates that there is still room to accelerate the spin dynamics in experiments.PACS numbers: 75.40. Gb, 78.20.Ls, 78.47.+p The potential application of ferromagnetic materials on ultrafast time scales is attractive for information storage. Both experimentally and theoretically the ultrashort time behavior of spin dynamics in transition metals is a new and challenging area. Vaterlaus et al. [1] were the first to study the spin dynamics in ferromagnetic Gd. Employing spin-and time-resolved photo-emission with 60 ps probe pulses they found a spin-lattice relaxation (SLR) of 100±80 ps. Using femtosecond optical and magneto-optical pump-probe techniques, Beaurepaire et al [2] have studied the relaxation processes of electrons and spins in ferromagnetic Ni. They reported that the magnetization of a 22 nm thick film drops rapidly during the first picosecond and reaches its minimum after 2 ps. Recently, by time-resolved second harmonic generation (SHG), Hohlfeld et al. [3] found that even when electrons and lattice have not reached a common thermal equilibrium, the classical M (T ) curve can be reproduced for delay times longer than the electron thermalization time of about 280 fs. On the other hand, the transient magnetization reaches its minimum ≈ 50 fs before electron thermalization. Both groups used polycrystalline Ni but different pulse durations: 60 fs [2] vs 150 fs [3]. Recently even faster spin decays have been observed [4].At present, not even the mechanism for this ultrafast spin relaxation is known. Moreover, it is of great importance to know whether these results already reflect the intrinsic spin relaxation time scale or not. Theoretically, even the static ferromagnetism in transition metals has been a challenging topic as the electron correlation is very strong in these systems [5]. The theoretical treatment of the spin dynamics is limited. On the longer time scales, SLR been studied previously [6], and the theory yielded a relaxation time of 48 ps for Gd, in good agreement with the above mentioned experiment [1]. On this time scale, the main contribution results from anisotropic phononmagnon interaction. To our knowledge, so far no theoretical study has been performed about the spin dynamics of transition metals on the femtosecond time scale, which is apparently needed.For the theoretical description of ultrafast nonequilibrium charge and spin dynamics, one can either rely on the Baym-Kadanoff-Keldysh Green's function approach [7] or employing an exact diagonalization framework. In this Letter, we ...

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Nonequilibrium Magnetization Dynamics of Nickel [Phys. Rev. Lett. 78, 4861 (1997)]

Cited by 25 publications

References 0 publications

Classical spin model of the relaxation dynamics of rare-earth doped permalloy

Classical spin model of the relaxation dynamics of rare-earth doped permalloy

Investigation of ultrafast spin dynamics in a Ni thin film

Ultrafast spin dynamics in nickel

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