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Coherent and incoherent ultrafast magnetization dynamics in 3d ferromagnets driven by extreme terahertz fields
Paul Scherrer Inst, CH-5232 Villigen, Switzerland;Beijing Adv Innovat Ctr Imaging Technol CNU, Key Lab Terahertz Optoelect, Beijing 100048, Peoples R China.
Univ Konstanz, Fachbereich Phys, Univ Str 10, D-78457 Constance, Germany.
Charles Univ Prague, Fac Math & Phys, DCMP, Ke Karlovu 5, CZ-12116 Prague 2, Czech Republic.
IBM Res Zurich, Saumerstr 4, CH-8803 Ruschlikon, Switzerland.
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2018 (Engelska)Ingår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, nr 1, artikel-id 014405Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Ultrafast spin dynamics in magnetic materials is generally associated with ultrafast heating of the electronic system by a near infrared femtosecond laser pulse, thus offering only an indirect and nonselective access to the spin order. Here we explore spin dynamics in ferromagnets by means of extremely intense THz pulses, as at these low frequencies the magnetic field provides a direct and selective route to coherently control the magnetization. We find that, at low fields, the observed off-resonantly excited spin precession is phase locked to the THz magnetic field. At extreme THz fields, the coherent spin dynamics become convoluted with an ultrafast incoherent magnetic quenching due to the absorbed energy. This demagnetization takes place upon a single shot exposure. The magnetic properties are found to be permanently modified above a THz pump fluence of approximate to 100 mJ/cm(2). We conclude that magnetization switching cannot be reached. Our atomistic spin-dynamics simulations excellently explain the measured magnetization response. We find that demagnetization driven by THz laser-field coupling to electron charges occurs, suggesting nonconducting materials for achieving coherent THz-magnetization reversal.

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AMER PHYSICAL SOC , 2018. Vol. 98, nr 1, artikel-id 014405
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URN: urn:nbn:se:uu:diva-360190DOI: 10.1103/PhysRevB.98.014405ISI: 000437109000003OAI: oai:DiVA.org:uu-360190DiVA, id: diva2:1247314
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet, 290605VetenskapsrådetSwedish National Infrastructure for Computing (SNIC)Knut och Alice Wallenbergs Stiftelse, 2015.0060Tillgänglig från: 2018-09-11 Skapad: 2018-09-11 Senast uppdaterad: 2018-09-11Bibliografiskt granskad

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Oppeneer, Peter M.

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