Surface-Step-Induced Magnetic Anisotropy in Epitaxial LSMO Deposited on Engineered STO Surfaces

Abstract

Changes in stoichiometry, temperature, strain and other parameters dramatically alter properties of LSMO perovskite. Thus, the sensitivity of LSMO may enable control of the magnetic properties of the film. This work demonstrates the capabilities of interface engineering to achieve the desired effects. Three methods of preparing STO substrates were conducted, i.e., using acid, buffer solution, and deionized water. The occurrence of terraces and their morphology depend on the preparation treatment. Terraces propagate on deposited layers and influence LSMO properties. The measurements show that anisotropy depends on the roughness of the substrate, the method of preparing the substrate, and oxygen treatment. The collected results suggest that the dipolar mechanism may be the source of LSMO anisotropy.

Room‐Temperature Multiferroicity and Magnetization Dynamics in Fe/BTO/LSMO Tunnel Junction

“…The crystal structure of the multilayer is the key functional aspect of the MFTJ. In particular, the oxide materials show high sensitivity to all disturbances, namely: interface roughness, [21][22][23][24] oxygen vacancy, [20] stress, [25] stoichiometry, [26,27] etc. Figure 1c shows the reflection high energy electron diffraction (RHEED) patterns after the deposition of the LSMO film.…”

“…The deposition process of the BTO(3 nm)/LSMO(35 nm) oxide layers was performed under 200 mTorr partial oxygen pressure and temperature of 750 °C. [19,20] After the first deposition, the stack was covered with a positive photoresist, exposed using optical lithography into 10 × 10 μm rectangles together with vias. Afterward, the stack was covered with a 30-nm thick layer of Al 2 O 3 using magnetron sputtering for insulation, which was followed by a lift-off process.…”

Simplified Determination of RHEED Patterns and Its Explanation Shown with the Use of 3D Computer Graphics

“…The energy of electrons was set to be 20 keV. Strontium titanate samples can be used as substrates to prepare multilayered nanostructures [ 7 ]. It is possible to enforce the termination of SrTiO3 crystals with TiO2 domains at surfaces and, in fact, such a sample was examined by us.…”

“…We can observe very good agreement between the experiment and theory. multilayered nanostructures [7]. It is possible to enforce the termination of SrTiO3 crystals with TiO2 domains at surfaces and, in fact, such a sample was examined by us.…”

“…High-quality thin films and related structures can be obtained using molecular beam epitaxy (e.g., [ 1 , 2 , 3 ]) or pulsed laser deposition (e.g., [ 4 , 5 , 6 , 7 ]). The ordering of atoms at the surface of samples can be verified by a number of different characterization techniques.…”