Structural, magnetic, and transport properties of high-quality epitaxial Sr2FeMoO6 thin films prepared by pulsed laser deposition

Abstract

We have succeeded in the preparation of a broad set of epitaxial Sr2FeMoO6 thin films by pulsed laser deposition. We have studied the effect of various deposition conditions, on both substrate-induced strain and antisite disorder (ASD), which translate into a variety of magnetic and transport properties of the films. We find that the saturation magnetization and the magnetoresistance are dominated by the degree of cationic order, and the strain effects are clearly evidenced in a lower TC. We characterize the ASD induced magnetoresistance, which arises from a moderate concentration of antisite defects and vanishes for massive ASD levels.

The effect of film thickness on the magnetic and magneto-transport properties of Sr2FeMoO6thin films

“…This gives the impression that the S2-film has more ASD than the thicker films. Eventhough the ASD normally increases the magnetoresistivity, recent results show that if the amount of ASD is high enough, which shows as increased zero field resistivity, the MR is reduced [26,27]. This could possibly explain the larger negative MR observed in thickest S8-film.…”

Reversible Low‐Field Magnetoresistance in Sr2Fe2–xMoxO6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

“…The resistivity values (in the 1-20 mX cm range) are in the same range as other reported data where careful attention has been paid to controlling oxygen content. [3,6] The largest measurable resistivity (and highest LFMR value) corresponds to the point at which the oxidation decomposition product SrMoO 4 just begins to appear (sample D3) or disappear (sample D5), i.e., samples on either side of the insulating sample D4. The LFMR value achieved for D3 is a maximum for the samples studied, 38 % at 50 K and 1 T, and, as far as we know, has not been previously exceeded.…”

“…[1] It therefore has promise for applications in spintronics and magnetic sensors. There have been numerous reports of optimization of processing conditions to yield high levels of cation ordering [2,3] and crystalline perfection, which are required to yield the theoretical saturation magnetization value of 4l B per formula unit (where l B is the Bohr magneton).…”

Unlocking the potential of half-metallicSr2FeMoO6films through controlled stoichiometry and double-perovs

“…[12] motivated numerous studies in fabrication of epitaxial films of Sr 2 FeMoO 6 , using pulsed laser deposition (PLD) and sputtering [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. However, it has proven challenging to grow Sr 2 FeMoO 6 films that are stoichiometric, phase pure, fully epitaxial and exhibit a high degree of Fe/Mo ordering.…”