Scientists / Open questions

Stuart S. P. Parkin

Spintronics; magnetic memory

13 questions

Microscopic origin and causal role of the magnetic anomalies accompanying the disappearance of superconductivity in overdoped La $_{2-x}$ Sr $_x$ CuO $_4$
Defect states in sputtered MgO tunnel barriers and the quantitative tunnelling-spin-polarization–TMR relation: surviving open questions from MgO(100)-barrier magnetic tunnel junctions
Reliable high-density operation of current-controlled magnetic domain-wall shift registers (racetrack memory): wall-structure control, minimum separation, annihilation, error rates, and many-bit scaling
Microscopic origin of the large spin–orbit torque in oxygen-incorporated tungsten (W(O))/CoFeB bilayers: quantitative partition between interfacial and bulk mechanisms, spin memory loss, and spin diffusion length
Microscopic determination of interface-magnon tunneling parameters and the magnon spectrum at realistic ferromagnet/insulator interfaces: extending the theory of inelastic (magnon-assisted) tunneling beyond the low-bias regime in magnetic tunnel junctions
Quantitative separation of tunneling spin polarization from quantum-well detector relaxation and field-dependent background polarization in CoFe/MgO(100)/GaAs spin light-emitting diodes
Microscopic origin of superconductivity in BEDT-TTF organic charge-transfer salts: from the pressure-induced superconductor (BEDT-TTF)4(ReO4)2 to the kappa-phase family
Microscopic theory of interlayer exchange coupling through 3d, 4d, and 5d transition-metal spacers: oscillation periods, strength systematics, and quantitative prediction in real multilayers
Experimental verification and quantitative validation of exchange-coupling-torque-driven domain-wall motion in fully compensated synthetic antiferromagnets
Microscopic origin and quantitative determination of spin-current transparency at Pt–ferromagnet interfaces and the intrinsic spin Hall angle of platinum
Tuning the Fermi level of the nodal-line semimetal ZrSiS into its non-symmorphic Dirac crossing and isolating line-node surface states
Enantiospecific interaction of chiral molecules with magnetized achiral substrates: establishing the microscopic mechanism, generality, and practical CISS-based enantioseparation
Room-temperature antiskyrmions in tetragonal $D_{2d}$ Heusler magnets: quantitative magnetostatics, material constants, zero-field stability, thin-film realization, and controllable dynamics

Back to open problems

Microscopic origin and causal role of the magnetic anomalies accompanying the disappearance of superconductivity in overdoped La2−x_{2-x}2−x​Srx_xx​CuO4_44​

Defect states in sputtered MgO tunnel barriers and the quantitative tunnelling-spin-polarization–TMR relation: surviving open questions from MgO(100)-barrier magnetic tunnel junctions

Reliable high-density operation of current-controlled magnetic domain-wall shift registers (racetrack memory): wall-structure control, minimum separation, annihilation, error rates, and many-bit scaling

Microscopic origin of the large spin–orbit torque in oxygen-incorporated tungsten (W(O))/CoFeB bilayers: quantitative partition between interfacial and bulk mechanisms, spin memory loss, and spin diffusion length

Microscopic determination of interface-magnon tunneling parameters and the magnon spectrum at realistic ferromagnet/insulator interfaces: extending the theory of inelastic (magnon-assisted) tunneling beyond the low-bias regime in magnetic tunnel junctions

Quantitative separation of tunneling spin polarization from quantum-well detector relaxation and field-dependent background polarization in CoFe/MgO(100)/GaAs spin light-emitting diodes

Microscopic origin of superconductivity in BEDT-TTF organic charge-transfer salts: from the pressure-induced superconductor (BEDT-TTF)4(ReO4)2 to the kappa-phase family

Microscopic theory of interlayer exchange coupling through 3d, 4d, and 5d transition-metal spacers: oscillation periods, strength systematics, and quantitative prediction in real multilayers

Experimental verification and quantitative validation of exchange-coupling-torque-driven domain-wall motion in fully compensated synthetic antiferromagnets

Microscopic origin and quantitative determination of spin-current transparency at Pt–ferromagnet interfaces and the intrinsic spin Hall angle of platinum

Tuning the Fermi level of the nodal-line semimetal ZrSiS into its non-symmorphic Dirac crossing and isolating line-node surface states

Enantiospecific interaction of chiral molecules with magnetized achiral substrates: establishing the microscopic mechanism, generality, and practical CISS-based enantioseparation

Room-temperature antiskyrmions in tetragonal D2dD_{2d}D2d​ Heusler magnets: quantitative magnetostatics, material constants, zero-field stability, thin-film realization, and controllable dynamics

Microscopic origin and causal role of the magnetic anomalies accompanying the disappearance of superconductivity in overdoped La $_{2-x}$ Sr $_x$ CuO $_4$

Room-temperature antiskyrmions in tetragonal $D_{2d}$ Heusler magnets: quantitative magnetostatics, material constants, zero-field stability, thin-film realization, and controllable dynamics