Long range phase coherencein double barrier magnetic tunnel junctions with large thick metallic quantum well

Abstract

Double barrier heterostructures are model systems for the study of electron tunneling and discrete energy levels in a quantum well (QW). Until now resonant tunneling phenomena in metallicQW have been observed for limited thicknesses (1-2 nm) under which electron phase coherence is conserved. In the present study we show evidence of QW resonance states in Fe QW up to12 nmthick and at room temperature in fully epitaxial doubleMgAlOxbarrier magnetic tunnel junctions. The electron phase coherence displayed in this QWis of unprecedented quality because ofa homogenous interface phase shift due to the small lattice mismatch at the Fe/MgAlOx interface. The physical understanding of the critical role of interface strain on QW phase coherence will greatly promote the development of the spin-dependent quantum resonant tunneling applications.

16 pages, 3 figures 1 table

References in corpus (5)

• A first-principles study of tunneling magnetoresistance in Fe/MgAl2O4/Fe(001) magnetic tunnel junctions
• Spin Diode Based on Fe/MgO Double Tunnel Junction
• Spin-dependent resonant tunneling through quantum-well states in magnetic metallic thin films
• Magnetic Diode Effect in Double Barrier Tunnel Junctions
• Symmetry Dependent Scattering by Minority Interface Resonance States in Single-crystal Magnetic Tunnel Junctions

Cited by in corpus (12)

• Comparison of laser induced and intrinsic tunnel magneto-Seebeck effect in CoFeB/MgAl${}_2$O${}_4$ and CoFeB/MgO magnetic tunnel junctions
• Large perpendicular magnetic anisotropy in epitaxial Fe/MgAl2O4(001) heterostructures
• Large influence of capping layers on tunnel magnetoresistance in magnetic tunnel junctions
• Tunnel magneto-Seebeck effect
• Enhancement of thermovoltage and tunnel magneto-Seebeck effect in CoFeB based magnetic tunnel junctions by variation of the MgAl${}_2$O${}_4$ and MgO barrier thickness
• Applications of Nanomagnets as Dynamical Systems
• Control of the Oscillatory Interlayer Exchange Interaction with Terahertz Radiation
• Orbital-excitation-dominated magnetization dissipation and quantum oscillation of Gilbert damping in Fe films
• Electric-Field Control of the Interlayer Exchange Coupling for Magnetization Switching
• Enhanced magnetoresistance in perpendicular magnetic tunneling junctions with MgAl2O4 barrier
• Unraveling spin texture and spin-orbit coupling contributions in spin triplet superconductivity
• Quantum-well tunneling anisotropic magnetoresistance above room temperature