We achieved the electrical control of a magnetic state by using an external magnetic field via electric field-induced resistance (EIR) change phenomena. We prepared a La0.7Sr0.3MnO3 (LSMO) film which showed EIR changes. Before the EIR treatment, the sample barely showed negative magnetoresistance (MR). After the EIR treatment, the value of negative MR became six times larger than that before the EIR treatment. The magnetization curves also changed from paramagnetism to superparamagnetism. These behaviors revealed that the EIR treatment changed not only the resistance state but also the magnetic state in LMSO film.
We investigated a multiple charge-injection mechanism of a magneto-electric (ME) capacitor. Although the capacitor showed a multi-step charge-injection process with regard to its capacitancevoltage (CV) characteristics, the behaviors were found to be different depending on the tunneling layer thickness. Detailed analyses of currentvoltage (IV) characteristics revealed the presence of multi-step behavior in a sample exhibiting a FowlerNordheim (FN) tunneling mechanism. With decreases in the tunnel layer thickness, the FN tunneling behavior shifted to a high voltage region, at which point the multi-step behavior became unclear. These results indicate that the tunnel layer thickness plays an important role in this multi-step mechanism.
We investigated the magnetic interaction between antiferromagnetic, magnetoelectric Cr2O3 film and ferromagnetic La0.7Sr0.3MnO3 film, which shows colossal magneto-resistance. Magnetic properties and structural analyses revealed that a decrease in the thickness of La0.7Sr0.3MnO3 films gives rise to a change in magnetic anisotropy from perpendicular to in-plane. The exchange interaction between Cr2O3 and La0.7Sr0.3MnO3 also changed depending on the magnetic properties of La0.7Sr0.3MnO3. This suggests that the crystallographical control and the selection of a suitable thickness of La0.7Sr0.3MnO3 are important to obtain an exchange interaction in the magnetic hetero system using colossal magneto-resistance material.
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