Magnetic and electrical properties of BiMnO₃ thin films

Abstract

BiMnO 3 thin films were deposited on single-crystal (001)-oriented SrTiO 3 substrates by rf-magnetron sputtering method. X-ray diffraction was used to analyze the crystal structure of the thin films, indicating that the films were monoclinic with two dominant orientation relationships along the substrate. The first is (111) BiMnO3 ║ (001) SrTiO3; the second is (222) BiMnO3 ║ (002) SrTiO3; other peaks showed that the films were polycrystalline. The roughness of the films was characterized by AFM. R vs. T was measured from 390 K to 15 K using a Keithley Model 167 Programmable Electrometer . Magnetic characterization was carried out by using a quantum design™ magnetometer for magnetization versus temperature and for hysteresis loops at different temperatures. The saturation magnetic moment of 2.8µ B per Mn ion (still fairly smaller than that of the bulk, 3.6µ B ) was observed at 5 K decreasing with increasing temperature.

Synthesis of orthorhombic rare-earth manganite thin films by a novel chemical solution route

“…Transition metal and rare-earth manganites, with general formula RMnO 3 , (R = rare-earth or transition metal ion) have attracted a lot of attention in the scientific community, due to their large variety of physical properties, as they can be dielectrics, metals, ferro-/ antiferromagnetics, multiferroics, magnetoelectrics, magnetocaloric or giant magnetoresistive materials [1][2][3][4][5][6][7]. At room temperature, these materials crystallize into two types of structures [8][9][10][11][12].…”

“…Among these methods, chemical solution deposition is one of the more promising techniques, because it provides higher composition control, lower processing temperatures, shorter fabrication time, and relative low cost [41]. It has been reported several chemical solution routes for processing transition metal and rare-earth manganite thin films, i.e., YMnO 3 [22,29,[31][32][33][34][37][38][39][40][41][42][43], GdMnO 3 [13,14,17], BiMnO 3 [5,17], DyMnO 3 [13,17] and LaMnO 3 [44,45]. However, it has been not reported a general chemical solution route for processing rare-earth and transition metal manganite thin films yet.…”

Ferroelectricity and Ferromagnetism Achieved via Adjusting Dimensionality in BiFeO3/BiMnO3 Superlattices

“…A weak net moment of 0.09 μ B /Fe is observed in single-layer BFO films at 10 K (see Figure S4a), which is presumably caused by the canted AFM structure of BFO Figure S4c,d shows a large net moment of 2.05 μ B /Mn with a FM transition temperature T C of approximately 90 K of single-layer BMO films. ,, The field-cooled (FC) temperature-dependent magnetization ( M – T ) curves of BFO n /BMO 10 SLs were measured under 1000 Oe with temperatures range from 10 to 400 K (see Figure d). All SLs display the T C of approximately 90 K, which is consistent with single-layer BMO films shown in Figure S4d.…”

Magnetic and electric properties of stoichiometric BiMnO3 thin films

“…However, the ferromagnetic properties of the film were not optimum: Tc  ~ 85 K, M sat  ~ 1 μ B /Mn. Ferromagnetic properties measured for BiMnO 3 films made using chemical solution deposition or rf-magnetron sputtering were less favorable compared to those of stoichiometric ceramic BiMnO 3 [19,20]. The depression in Curie temperature can be attributed to a non-stoichiometric composition, to strain, or to size effects [1].…”