Abstract
The ultrafast optical response of the magnetic compound Bi2FeMnO6 (BFMO) is studied through 100–300 K by means of ultrafast transient reflectivity spectroscopy. By using differing pump energy, the optical low spin (LS) transition and high spin (HS) transition in this compound are distinguished as the temperature varies. This charge transfer transition is shown to be spin-dependent and element selected. The ultrafast spin-lattice coupling time also shows the element selected feature, which illustrated the two independent magnetic phase transitions to the antiferromagnet (AFM) Mn–O–Mn and the ferrimagnet (FIM) Mn–O–Fe order, respectively.
Highlights
Multiferroic materials possess spontaneous electric and magnetic order which offers integration possibilities for multiple functionalities in a single material [1,2]
We report the temperature dependent, ultrafast charge transfer in Bi2 FeMnO6 /Si film, a compound of d-electron materials
The well crystallized single-phase Bi2 FeMnO6 film was deposited on a silicon substrate using a pulsed laser deposition method (PLD) at 923 K with 500–600 mTorr dynamic oxygen
Summary
Multiferroic materials possess spontaneous electric and magnetic order which offers integration possibilities for multiple functionalities in a single material [1,2]. Multiferroics open a new venue for controlling the magnetism by applied electrical field through magneto-electric coupling at room temperature, and vice versa [3,4]. The G-type anti-ferromagnetic form and the incommensurate spin cycloid structure makes the electric-magnetic coupling rarely weak in bismuth ferrite [5]. BiMnO3 shows ferromagnetic order and ferroelectric order below 100 K [6]. The mixing compound Bi2 FeMnO6 drove much concern in recent years [7,8,9].
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