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Ultrafast all-optical magnetic switching in NaTb(WO 4 ) 2


The operation of an all-optical magnetic switching based on the paramagnetic NaTb(WO 4 ) 2 NaTb ( WO 4 ) 2 crystals is carried out by the time-resolved magneto-optical Faraday effect. Our results demonstrate that the switching time can be as fast as ∼ 500 fs ∼ 500 fs at room temperature. The switching amplitude shows a linear dependence on the excitation intensity, which is proportional to the magnetization induced by the circularly polarized light. Based on the inverse Faraday effect in magneto-optical crystal, the switching mechanisms arising from circular dichroism and birefringence are discussed. By tailoring the magneto-optical properties of NaTb(WO 4 ) 2 NaTb ( WO 4 ) 2 crystal, the switching magnitude can be modulated.



Applied Physics LettersAmerican Institute of Physics

Published: May 17, 2010

Keywords: birefringence; circular dichroism; Faraday effect; light polarisation; magnetic switching; magnetisation; magneto-optical effects; niobium compounds; paramagnetic materials; terbium compounds

DOI: 10.1063/1.3432072

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