ESR Study of (La,Ba)MnO₃/ZnO Nanostructure for Resistive Switching Device

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Perovskite manganites like (La,Ba)MnO3 exhibit complex magnetic and electronic properties.
• ZnO is a versatile semiconductor with applications in electronics and spintronics.
• Heterostructures combining these materials offer potential for novel device functionalities.

Purpose of the Study:

• To investigate the structural, electrical, and magnetic properties of (La,Ba)MnO3/ZnO nanostructures.
• To explore the rectification and resistive switching behaviors.
• To analyze the temperature-dependent magnetic phase composition.

Main Methods:

• Growth of (La,Ba)MnO3/ZnO nanostructure on SrTiO3 (001) substrate.
• Electrical measurements to determine rectification and resistive switching.
• Electron spin resonance (ESR) spectroscopy for magnetic property analysis.

Main Results:

• Observed good rectification behavior at room temperature with a factor of ~210 at low voltages (< 0.2 V).
• Resistive switching properties were induced at higher voltages.
• ESR analysis revealed coexistence of ferromagnetic and paramagnetic phases below 260 K, with no magnetic phase separation at higher temperatures.

Conclusions:

• The (La,Ba)MnO3/ZnO nanostructure exhibits promising diode characteristics and voltage-controlled resistive switching.
• The magnetic state is complex, involving phase coexistence, which may influence the observed electrical properties.
• Potential mechanisms for resistive switching, including magnetic phase separation and oxygen vacancy migration, are discussed.