Magnetic properties of (Bi1−xLax)(Fe,Co)O3 films fabricated by a pulsed DC reactive sputtering and demonstration of magnetization reversal by electric field

Abstract

Abstract(Bi1−xLax)(Fe,Co)O3 multiferroic magnetic film were fabricated using pulsed DC (direct current) sputtering technique and demonstrated magnetization reversal by applied electric field. The fabricated (Bi0.41La0.59)(Fe0.75Co0.25)O3 films exhibited hysteresis curves of both ferromagnetic and ferroelectric behavior. The saturated magnetization (Ms) of the multiferroic film was about 70 emu/cm3. The squareness (S) (= remanent magnetization (Mr)/Ms) and coercivity (Hc) of perpendicular to film plane are 0.64 and 4.2 kOe which are larger compared with films in parallel to film plane of 0.5 and 2.5 kOe. The electric and magnetic domain structures of the (Bi0.41La0.59)(Fe0.75Co0.25)O3 film analyzed by electric force microscopy (EFM) and magnetic force microscopy (MFM) were clearly induced with submicron scale by applying a local electric field. This magnetization reversal indicates the future realization of high performance magnetic device with low power consumption.

Magnetization reversal of [Co/Pd] perpendicular magnetic thin film dot on (Bi,La)(Fe,Co)O3multiferroic thin film by applying electric field

“…Although the origin of this property is not clear yet, we will discuss about this by fabrication of many BiFeO 3 -based thin films with various substituting elements. Previously, we showed that 300 nm thick BLFCO thin films fabricated by the pulsed-DC reactive sputtering technique possessed a single-phase crystalline structure and a Curie temperature of 420 K[25]. These results indicate a multiferroic property of the thin film with both ferromagnetism and ferroelectricity at room temperature.…”

“…The local electric field was applied through the conductive and magnetic Co-Cr-Pt tip of the SPM. Previously we showed that a local electric field induces magnetic and electric domains in BBFO and BLFCO thin films and that magnetization reversal occurs on the microscale [22,24,25]. In this figure, a −10 V local electric field is applied to the left [Co/Pd] dot.…”

“…The maximum M s , perpendicular coercivity (H c⊥ ), and Curie temperature were 70 emu cm −3 , 4.0 kOe, and 420 K, respectively. We then demonstrated magnetization reversal in BLFCO thin films under a local electric field with a width of several hundred nanometers [24,25].…”

Structural and Magnetic Properties of Perovskite Functional Nanomaterials La1−xRxFeO3 (R = Co, Al, Nd, Sm) Obtained Using Sol-Gel

“…Figure 12 shows the hysteresis loop of the La 1−x Co x FeO 3 (x = 0~0.25) sample. When the applied magnetic field is 8000 Oe, the magnetization reaches a saturation state [35]. As shown in Table 5, with the increase in Co 2+ concentration, the magnetic loop area and magnetization increased.…”

Effects of electric field and light on resistivity switching of Eu0.7Sr0.3MnO3 thin films

“…In recent years, due to the rapid development of electronic information technology, the magnetic and electric materials with good performances, such as sensitivity, reliability, low power consumption and so on have been paid more attention by researchers. [1][2][3][4][5][6] However, the traditional single-phase magnetoelectric functional materials are increasingly unable to meet the above requirements. They have working temperatures that are too low, and the magnetization or polarization is small.…”