Excitation of electromagnetic waves under the impact of light on a magnetic film

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Resumo

The problem of electromagnetic wave emission from a magnetic film under the influence of a short pulse of light from a femtosecond laser is considered. The model of accelerated motion of magnetic charges is proposed as the cause of radiation. The proportionality of the field of the emitted wave to the second derivative of the magnetization in time is revealed. Pulses of two types — rectangular and half-sinusoidal — are proposed for consideration. It is shown that the field of the radiated wave for a half-sinusoidal pulse exceeds the field from a rectangular pulse more than twice.

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Sobre autores

V. Vlasov

Syktyvkar State University named after P. Sorokin

Email: vshcheg@cplire.ru
Rússia, Oktyabrsky Prospekt, 55, Syktyvkar, 167001

V. Shavrov

Kotelnikov Institute of Radio Engineering and Electronics RAS

Email: vshcheg@cplire.ru
Rússia, Mokhovaya Str. 11, Bild. 7, Moscow, 125009

V. Shcheglov

Kotelnikov Institute of Radio Engineering and Electronics RAS

Autor responsável pela correspondência
Email: vshcheg@cplire.ru
Rússia, Mokhovaya Str. 11, Bild. 7, Moscow, 125009

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2. Fig. 1. Schematic diagram of the pump-probe method geometry: 1 — film, 2 — beam of light from a femtosecond laser (pump), 3 — incident beam of probe light, 4 — reflected beam of probe light.

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3. Fig. 2. Geometry of the problem of the field of a moving charge qm.

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4. Fig. 3. Shape of the light pulse from a femtosecond laser: 1 - rectangular, 2 - half-sinusoidal.

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5. Fig. 4. Time dependences of film temperature: 1 - by formula (37); 2 - by formula (45); 3 - by formula (48): α = 10 ps-1, β = 5 ps-1, τe = 0.2 ps; T1 = 300 K; T2 = 472.93 K; Tp = 500 K.

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6. Fig. 5. Dependence of normalised magnetisation on time, constructed at Mg = 0.055 using different formulas: 1 — according to formula (52); 2 — according to formula (53); 3 — according to formula (54); the nature of the dashed curves is the same as in Fig. 4; T1 = 300 K, Tp = 500 K, Te = 631 K, τe = 0.2 ps, α = 10 ps–1, β = 5 ps–1.

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7. Fig. 6. Dependences of the radiated wave field on time: 1 - heating by a rectangular pulse (formula (56)); 2 - heating by a sinusoidal pulse (formula (59)); 3 - cooling (formula (64)). The parameters are the same as in Fig. 5.

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