Electric field tuning of phase separation in manganite thin films

Abstract

In this paper, we investigate the electric field effect on epitaxial Pr 0.65 (Ca 0.75 Sr 0.25 ) 0.35 MnO 3 thin films in electric double-layer transistors. Different from the conventional transistors with semiconducting channels, the sub(micrometer)-scale phase separation in the manganite channels is expected to result in inhomogeneous distribution of mobile carriers and local enhancement of electric field. The field effect is much larger in the low-temperature phase separation region compared to that in the high-temperature polaron transport region. Further enhancement of electroresistance is achieved by applying a magnetic field, and a 250% modulation of resistance is observed at 80 K, equivalent to an increase of the ferromagnetic metallic phase fraction by 0.51%, as estimated by the general effective medium model. Our results illustrate the complementary nature of electric and magnetic field effects in phase-separated manganites, providing insights on such novel electronic devices based on complex oxides.

Voltage‐Control of Magnetism in All‐Solid‐State and Solid/Liquid Magnetoelectric Composites

“…[49] In case of 13 nm films, the attained large values of surface charge up to 250 µC cm −2 enabled a maximum reversible modulation in magnetization of about 30% at room temperature. Several other comprehensive studies contributed to disentangle the complex relationship between charge carrier doping and magnetism in electrolyte-gated magnetic oxides, including investigations on LCMO, [80,91] LSMO, [43,156] LaMnO 3 , [67] Pr 1−x (Ca 1−y Sr y ) x MnO 3 , [157,158] LSCO, [82] Fe 3 O 4 , [159] and γ-Fe 2 O 3 . [42] In addition, the magnetic response was flexibly modulated in-phase or antiphase with respect to the induced surface charge by judiciously adjusting the applied bias voltage (see Figure 4b).…”

Asymmetric electroresistance of cluster glass state in manganites

“…[23][24][25][26] XRD measurements were performed using a X-ray diffractometer (SmartLab, Rigaku) in the highresolution mode. Transport and gating measurements were carried out in a physical property measurement system (PPMS-14 T, Quantum Design) with externally connected meters.…”

Application of Perovskite‐Structured Materials in Field‐Effect Transistors

“…[83] For instance, Lee et al fabricated EDLT using STO (100) as the channel and Al/Ti/Au as electrodes. The sensitivity of the electric field effect is dependant on the applied magnetic field, and a maximum resistance modulation of 2.5 times was achieved at 80 K with a magnetic field of 1.38 T. [92] A gate-controlled Kondo effect was demonstrated in the 2D electron system, which indicates that this system is a combination of magnetic Ti 3+ ions (e.g., localized and unpaired electrons) and delocalized electrons that partially fills the Ti 3d conduction band.…”

“…[85] Multiple electrolytes were used as dielectric electrolyte, including polyethylene oxide with KClO 4 , [80] N,N-diethyl-N-(2methoxyethyl)-N-methylammonium bis (trifluoromethyl sulphonyl)-imide (DEME-TFSI), [82] and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide (EMI-TFSA). The EDLT with the strained CMO exhibited a conductivity modulation of about 120 times at 50 K and four times at room temperature upon an applied gate voltage of 2 V. [91] Lourembam et al [92] demonstrated EDLT using Pr 0.65 (Ca 0.75 Sr 0.25 ) 0.35 MnO 3 thin film as the channel, (LaAlO 3 ) 0.3 -(Sr 2 AlTaO 6 ) 0.7 (001) as substrate, Au as the electrode, and ionic liquid DEME-TFSI as the gate dielectric. The electrolyte was synthesized by gelation of poly(styrene-block-methylmethacrylateblock-styrene) (PS-PMMA-PS) in an ionic liquid EMI-TFSA.…”

“…If the cathode or anode were replaced by semiconductor, an electric-double-layer transistor (EDLT) was established. The carrier density is about 2.2 × 10 13 cm −2 at room temperature and about 3.0 × 10 13 cm −2 at 2 K. [85] Other perovskites materials such as NdNiO 3 , [87,88] KTaO 3 , [89] BaSnO 3 , [90] Ca 1−x Ce x MnO 3 , [91] and Pr 0.65 (Ca 0.75 Sr 0.25 ) 0.35 MnO 3 [92] were also utilized to configure EDLT. [81] The most widely studied perovskite materials for EDLT is STO.…”