Browsing by Author "Materials Research Science & Engineering Center"
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Item Data for Magnetization dynamics in synthetic antiferromagnets with perpendicular magnetic anisotropy(2023-11-09) Huang, Dingbin; Zhang, Delin; Kim, Yun; Wang, Jian-Ping; Wang, Xiaojia; wang4940@umn.edu; Wang, Xiaojia; Materials Research Science & Engineering CenterThis repository contains data along with associated output from instrumentation supporting all results reported in Huang, D.; Zhang, D.; Kim, Y; Wang, J.P.; and Wang X. Magnetization dynamics in synthetic antiferromagnets with perpendicular magnetic anisotropy. Phys. Rev. B., 2023, 107, 214438. The magnetization dynamics of the perpendicular synthetic antiferromagnets (p-SAFs) sample is detected by time-resolved magneto-optical Kerr effect (TR-MOKE), which is ultrafast-laser-based metrology utilizing a pump-probe configuration. In TR-MOKE, pump laser pulses interact with the sample, initiating magnetization dynamics in magnetic layers via inducing ultrafast thermal demagnetization. The laser-induced heating brings a rapid decrease to the magnetic anisotropy fields and interlayer exchange coupling (IEC), which changes equilibrium direction of magnetization in each layer and initiates the precession. The magnetization dynamics due to pump excitation is detected by a probe beam through MOKE. In our setup, the incident probe beam is normal to the sample surface (polar MOKE); therefore, the Kerr rotation angle (θ_K) of the reflected probe beam is proportional to the z component of the magnetization.Item Supporting data for Mending Cracks Atom-by-atom in Rutile TiO2 with Electron Beam Radiolysis(2023-08-28) Guo, Silu; Yun, Hwanhui; Nair, Sreejith; Jalan, Bharat; Mkhoyan, K. Andre; mkhoyan@umn.edu; Mkhoyan, K. Andre; Materials Research Science & Engineering CenterExperimental data for a manuscript "Mending Cracks Atom-by-atom in Rutile TiO2 with Electron Beam Radiolysis". Essential data includes scanning transmission electron microscopy (STEM) raw images and electron energy-loss spectroscopy (EELS) spectrum data. Important atomic line scans data and radiolysis cross section data file are included to support our “two-step rolling” model of mobile octahedral building blocks enabling radiolysis-driven atomic migration.Item Supporting data for spectral rigidity of non-Hermitian symmetric random matrices near the Anderson transition(2020-10-27) Shklovskii, Boris, I; Huang, Yi; shklo001@umn.edu; Shklovskii, Boris, I; Materials Research Science & Engineering CenterWe numerically calculate the number variance in the three dimensional TME model and study the evolution of the number variance as a function of average number of eigenvalues with different disorder parameters as the system goes from a metal to an insulator. We use statistics of complex eigenvalues obtained by diagonalization of the TME model on many realizations of cubic lattices with side length L = 8,12,16. The diagonalization is done using LAPACK algorithm. The TME model may be used to describe a random laser.Item Supporting data for Surface Structure Dependent Circular Dichroism in Single and Double Gyroid Metamaterials(2022-06-16) William, Lenart R; Ellison, Christopher J; Ferry, Vivian E; Cote, Bryan M; veferry@umn.edu; Ferry, Vivian E.; Materials Research Science & Engineering CenterData includes the processed FDTD simulation results needed to recreate the figures in "Surface Structure Dependent Circular Dichroism in Single and Double Gyroid Metamaterials". The data files include single and double gyroids' reflection, transmission, and absorption spectra, near-field electric field intensity enhancements, and the gyroid 3D models used in the FDTD simulations.Item Supporting data for Temperature-dependent thermal conductivity of MBE-grown epitaxial SrSnO₃ films(2023-11-06) Zhang, Chi; Liu, Fengdeng; Guo, Silu; Zhang, Yingying; Xu, Xiaotian; Mkhoyan, Andre; Jalan, Bharat; Wang, Xiaojia; wang4940@umn.edu; Wang, Xiaojia; Materials Research Science & Engineering CenterThis work studies the temperature-dependent thermal properties of a single crystalline SSO thin film prepared with hybrid molecular beam epitaxy. By combining time-domain thermoreflectance and Debye–Callaway modeling, physical insight into thermal transport mechanisms is provided. At room temperature, the 350-nm SSO film has a thermal conductivity of 4.4 W m¯¹ K¯¹ , ∼60% lower than those of other perovskite oxides (SrTiO₃, BaSnO₃) with the same ABO₃ structural formula. This difference is attributed to the low zone-boundary frequency of SSO, resulting from its distorted orthorhombic structure with tilted octahedra. At high temperatures, the thermal conductivity of SSO decreases with temperature following a ∼T ¯⁰∙⁵⁴ dependence, weaker than the typical T¯¹ trend dominated by the Umklapp scattering. Corresponding author for STEM data is K. Andre Mkhoyan. Corresponding author for film growth and XRD data is Bharat Jalan. Corresponding author for TDTR data is Xiaojia Wang.Item Supporting data for Wide-range continuous tuning of the thermal conductivity of La0.5Sr0.5CoO3−δ films via room-temperature ion-gel gating(2023-04-19) Zhang, Yingying; Postiglione, William M; Xie, Rui; Zhang, Chi; Zhou, Hao; Chaturvedi, Vipul; Heltemes, Kei; Zhou, Hua; Feng, Tianli; Leighton, Chris; Wang, Xiaojia; wang4940@umn.edu; Wang, Xiaojia; Materials Research Science & Engineering CenterThese files contain data along with associated output from instrumentation supporting all results reported in Wide-range continuous tuning of the thermal conductivity of La0.5Sr0.5CoO3-delta films via room-temperature ion-gel gating. Solid-state control of the thermal conductivity of materials is of exceptional interest for novel devices such as thermal diodes and switches. Here, we demonstrate the ability to continuously tune the thermal conductivity of nanoscale films of La0.5Sr0.5CoO3-delta (LSCO) by a factor of over 5, via a room-temperature electrolyte-gate-induced non-volatile topotactic phase transformation from perovskite (with ≈ 0.1) to an oxygen-vacancy-ordered brownmillerite phase (with = 0.5), accompanied by a metal-insulator transition. Combining time-domain thermoreflectance and electronic transport measurements, model analyses based on molecular dynamics and Boltzmann transport, and structural characterization by X-ray diffraction, we uncover and deconvolve the effects of these transitions on heat carriers, including electrons and lattice vibrations. The wide-range continuous tunability of LSCO thermal conductivity enabled by low-voltage (below 4 V) room-temperature electrolyte gating opens the door to non-volatile dynamic control of thermal transport in perovskite-based functional materials, for thermal regulation and management in device applications. Authors to whom correspondence should be addressed are Chris Leighton (leighton@umn.edu) and Xiaojia Wang (wang4940@umn.edu).