Structural, optical, magnetic and Faraday rotation properties of MnSe2: Eu doped diamagnetic materials: The impact of multi-valence states of Mn and Eu

Abstract

Rare earth ions coupled magnetic, electronic and magneto-optical properties of transition metal dichalcogenides are attractive due to interaction of lattice, spin and electronic degree of freedom. For the first time, Eu doped MnSe2 nano-cubes were synthesized and characterized, and the influences to structural and properties of Faraday rotating glass were studied. The introduction of mixed valence states of Eu disturbed the self-assembly of MnSe2 and enhanced the antiferromagnetism due to the vacancies induced by the charge neutral and radius/electronegativity difference. Mn0.9Eu0.1Se2 presenting smaller grain size and better crystallization was selected as dopant to heavy metal oxide glass matrix. The rich energy levels of significant d-d, f-f electron transitions of Mn and Eu ions in Mn0.9Eu0.1Se2 contributed to the improvement of optical linear and nonlinear properties. The band gaps of glasses were decreased and the absorption edges red-shifted. Meanwhile, the third nonlinearity was improved due to increase of polarizability. The spin interactions and electrons charge interactions between Eu and Mn ions in glass provided complex magnetization changing from diamagnetic, paramagnetic and antiferromagnetic. 3% of Mn0.9Eu0.1Se2 functionalized glass showed excellent optical emission at 560 nm and 620 nm wavelengths, good nonlinear coefficient (5.88 × 10−14 esu), high paramagnetic moment (8.28 × 10−6 emu/mol) and giant Verdet constant value (63.998 rad/T/m at 633 nm).