A5103129609- Magnetic properties of thin films
- Topological Materials and Phenomena
- Magneto-Optical Properties and Applications
- Advanced Memory and Neural Computing
- Theoretical and Computational Physics
- Physics of Superconductivity and Magnetism
- Graphene research and applications
- Advanced Condensed Matter Physics
- Magnetic Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Liquid Crystal Research Advancements
- Iron oxide chemistry and applications
- Random lasers and scattering media
- Ferroelectric and Negative Capacitance Devices
- Surface Roughness and Optical Measurements
- Quantum many-body systems
- Quantum and electron transport phenomena
- 2D Materials and Applications
- Surface and Thin Film Phenomena
- Electrocatalysts for Energy Conversion
- Advanced Optical Imaging Technologies
- Multiferroics and related materials
- Copper-based nanomaterials and applications
- Catalytic Processes in Materials Science
- Photonic Crystals and Applications
National Tsing Hua University
2017-2025
National Taiwan Normal University
2007
Abstract Harnessing the spin–momentum locking of topological surface states in conjunction with magnetic materials is first step to realize novel insulator-based devices. Here, we report strong interfacial coupling Bi 2 Se 3 /yttrium iron garnet (YIG) bilayers manifested as large in-plane anisotropy (IMA) and enhancement damping probed by ferromagnetic resonance. The IMA reaches a maximum when film approaches its two-dimensional limit, indicating that play an important role magnetization...
Thulium iron garnet (TmIG) films with perpendicular magnetic anisotropy (PMA) were grown on gadolinium gallium (GGG) (111) substrates by off-axis sputtering. High-resolution synchrotron radiation X-ray diffraction studies and spherical aberration-corrected scanning transmission electron microscope (Cs-corrected STEM) images showed the excellent crystallinity of their sharp interface GGG. Damping constant TmIG thin film was determined to be 0.0133 frequency-dependent ferromagnetic resonance...
Abstract The antiferromagnet (AFM) and ferromagnet (FM) interface is a unique branch of magnetics broad scientific interest. AFMs play an important role in spin‐orbit torque devices based on their ability to generate spin‐polarized current exchange bias when combined with FMs. In this study, interesting (SOT) ratchet involving the spring effect IrMn/CoFeB bilayer device perpendicular anisotropy developed. use electrical spectroscopic analysis reveals that yields unidirectional anisotropy,...
High-quality single-crystal thulium iron garnet (TmIG) films of 10-30 nm thick were grown by off-axis sputtering at room temperature (RT) followed post-annealing. X-ray photoelectron spectroscopy (XPS) was employed to determine the TmIG film composition optimize growth conditions, along with aid x-ray diffraction (XRD) structural analysis and atomic force microscope (AFM) for surface morphology. The optimized exhibited perpendicular magnetic anisotropy (PMA) saturation magnetization RT ∼99...
Transport signatures of exchange gap opening because magnetic proximity effect (MPE) are reported for bilayer structures $\mathrm{B}{\mathrm{i}}_{2}\mathrm{S}{\mathrm{e}}_{3}$ thin films on yttrium iron garnet (YIG) and thulium (TmIG) perpendicular anisotropy (PMA). Pronounced negative magnetoresistance (MR) was detected, attributed to an emergent weak localization (WL) superimposing a antilocalization (WAL). Thickness-dependent study shows that the WL originates from time-reversal-symmetry...
Abstract Recently, high‐entropy alloy (HEA) nanocatalysts have shown outstanding catalytic performance. However, their integration with semiconductors for photocatalytic reactions remains largely unexplored. Here, Pd@HEA core–shell nanocrystals controlled compositions and facets on TiO 2 supports are synthesized, achieving significantly enhanced hydrogen production. Compared to Pd@Pt/TiO , Pd@Pt 0.4 Pd 0.15 Ir Ru Rh nanocubes/TiO exhibit superior photoactivity, driven by optimized Schottky...
Abstract Antiferromagnet (AFM) has currently participated in the spin‐orbit torque (SOT) technology due to its great potential be applied field‐free SOT switching and promote thermal stability of MRAM. However, effect varying AFM ordering on associated properties is still not comprehensively understood. This work reports how an modifies strength Dzyaloshinskii–Moriya‐interaction (DMI) a heavy metal (Pt)/FM (Co)/AFM (IrMn) trilayer effects switching. Increasing reflects enhanced exchange bias...
The integration of quantum materials like topological insulators (TIs) with magnetic (MIs) has important technological implications for spintronics and computing. Here, we report excellent crystallinity c-axis oriented epitaxial TI films Bi2Se3 grown on MI films, a rare earth iron garnet (ReIG), such as thulium (Tm3Fe5O12, TmIG), by molecular beam epitaxy using Se-buffered low-temperature growth technique. Strained-TmIG robust perpendicular anisotropy were deposited off-axis sputtering. We...
Study of the exchange bias (Hex) switching in a ferromagnet (FM)/antiferromagnet (AFM) bilayer driven by spin–orbit torque (SOT) has currently been an explicit research field for various SOT applications, but complete understanding AFM and its interaction with at FM/AFM interface remains elusive. This study reports SOT-driven hidden order transition behind Hex heavy metal (Pt)/FM (Co)/AFM (IrMn) trilayer along between Co magnetization (with perpendicular anisotropy) IrMn spins. The coupling...
To preserve the high quality topological surface state after air exposure without degradation, it is crucial to identify an effective capping layer. In this study, we report layer obtained by crystallizing Se. Upon extended ultrahigh vacuum or humid air, show using x-ray photoemission spectroscopy that stability and resistance oxidation of crystalline Se layers are superior those amorphous layer, which has been commonly used current communities. Furthermore, time-dependent Hall measurements...
This work applied an anisotropic magneto-resistance effect for studying the spin–orbit torque (SOT)-driven magnetization switching in antiferromagnetic heavy alloy/ferromagnet, PtMn/Co bilayer, under y-type SOT geometry. The tailorable magneto-structural ordering of PtMn provides additional dimension to study interplay among efficiency, interfacial spin configuration, and switching. results reveal that efficiency PtMn, effective field generated by current, can be enhanced via forming L10...
In the group of Mn-based antiferromagnetic materials, PtMn shows high enough thermal stability to fit requirement temperature in BEOL. We worked on a field-free switching device with application PtMn, which can be integrated into perpendicular MRAM stacks and processes With help from ferromagnetic coupling SAF is pinned by we get switching, further increase pillar size compared traditional stray-field MRAM.
Antiferromagnets (AFMs) exhibit spin arrangements with no net magnetization, positioning them as promising candidates for spintronics applications. While electrical manipulation of the single-crystal AFMs, composed periodic configurations, is achieved recently, it remains a daunting challenge to characterize and manipulate polycrystalline AFMs. Utilizing statistical analysis in data science, we demonstrate that AFMs can be described using real, symmetric, positive semi-definite, rank-two...
Abstract Antiferromagnets (AFMs) exhibit spin arrangements with no net magnetization, positioning them as promising candidates for spintronics applications. While electrical manipulation of the single-crystal AFMs, composed periodic configurations, is achieved recently, it remains a daunting challenge to characterize and manipulate polycrystalline AFMs. Utilizing statistical analysis in data science, we demonstrate that AFMs can be described using real, symmetric, positive semi-definite,...