Blar i Institutt for fysikk på tidsskrift "Physical Review B. Condensed Matter and Materials Physics"
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Anomalous domain wall velocity and Walker breakdown in hybrid systems with anisotropic exchange
(Journal article; Peer reviewed, 2013)It has recently been proposed that spin-transfer torques in magnetic systems with anisotropic exchange can be strongly enhanced, reducing the characteristic current density with up to four orders of magnitude compared to ... -
Asymmetric ferromagnetic resonance, universal Walker breakdown, and counterflow domain wall motion in the presence of multiple spin-orbit torques
(Journal article; Peer reviewed, 2013)Measurement of the maximum blood flow velocity is the primary means for determining the degree of carotid stenosis using ultrasound. The current standard for estimating the maximum velocity is Pulsed Wave (PW) Doppler with ... -
Backscattering in helical edge states from a magnetic impurity and Rashba disorder
(Journal article; Peer reviewed, 2016)Transport by helical edge states of a quantum spin Hall insulator is experimentally characterized by a weakly temperature-dependent mean free path of a few microns and by reproducible conductance oscillations, challenging ... -
Chirality-sensitive domain wall motion in spin-orbit coupled ferromagnets
(Journal article; Peer reviewed, 2013)Using the Lagrangian formalism, we solve analytically the equations of motion for current-induced domain wall dynamics in a ferromagnet with Rashba spin-orbit coupling. An exact solution for the domain wall velocity is ... -
Controllable spin-transfer torque on an antiferromagnet in a dual spin-valve
(Journal article; Peer reviewed, 2011)We consider current-induced spin-transfer torque on an antiferromagnet (AFM) in a dual spin-valve setup. It is demonstrated that a net magnetization may be induced in the AFM by partially or completely aligning the sublattice ... -
Controlling the switching field in nanomagnets by means of domain-engineered antiferromagnets
(Journal article, 2015)Using soft x-ray spectromicroscopy, we investigate the magnetic domain structure in embedded nanomagnets defined in La0.7Sr0.3MnO3 thin films and LaFeO3/La0.7Sr0.3MnO3 bilayers. We find that shape-controlled antiferromagnetic ... -
Critical temperature and tunneling spectroscopy of superconductor-ferromagnet hybrids with intrinsic Rashba-Dresselhaus spin-orbit coupling
(Journal article, 2015)We investigate theoretically how the proximity effect in superconductor/ferromagnet hybrid structures with intrinsic spin-orbit coupling manifests in two measurable quantities, namely the density of states and critical ... -
Electrically driven Bose-Einstein condensation of magnons in antiferromagnets
(Journal article; Peer reviewed, 2017)We explore routes to realize electrically driven Bose-Einstein condensation of magnons in insulating antiferromagnets. Even in insulating antiferromagnets, the localized spins can strongly couple to itinerant spins in ... -
Equations of motion and frequency dependence of magnon-induced domain wall motion
(Journal article; Peer reviewed, 2017)Spin waves can induce domain wall motion in ferromagnets. We derive the equations of motion for a transverse domain wall driven by spin waves. Our calculations show that the magnonic spin-transfer torque does not cause ... -
Giant triplet proximity effect in π-biased Josephson junctions with spin-orbit coupling
(Journal article, 2015)In diffusive Josephson junctions the phase difference φ between the superconductors strongly influences the spectroscopic features of the layer separating them. The observation of a uniform minigap and its phase modulation ... -
Improved domain-wall dynamics and magnonic torques using topological insulators
(Journal article, 2014)We investigate the magnetization dynamics that arises when a thin-film ferromagnet is deposited on a topological insulator (TI), focusing in particular on domain-wall motion via current and the possibility of a spin-wave ... -
Interplay between superconductivity and ferromagnetism on a topological insulator
(Journal article; Peer reviewed, 2010)We study theoretically proximity-induced superconductivity and ferromagnetism on the surface of a topological insulator. In particular, we investigate how the Andreev-bound states are influenced by the interplay between ... -
Intrinsic magnetization of antiferromagnetic textures
(Journal article, 2016)Antiferromagnets (AFMs) exhibit intrinsic magnetization when the order parameter spatially varies. This intrinsic spin is present even at equilibrium and can be interpreted as a twisting of the homogeneous AFM into a state ... -
Josephson effect in graphene bilayers with adjustable relative displacement
(Peer reviewed; Journal article, 2020)The Josephson current is investigated in a superconducting graphene bilayer where pristine graphene sheets can make in-plane or out-of-plane displacements with respect to each other. The superconductivity can be of an ... -
Josephson effect in S/F/S junctions: Spin bandwidth asymmetry versus Stoner exchange
(Journal article; Peer reviewed, 2011)We analyze the dc Josephson effect in a ballistic superconductor/ferromagnet/superconductor junction by means of the Bogoliubov–de Gennes equations in the quasiclassical Andreev approximation. We consider the possibility ... -
Josephson effect through magnetic skyrmions
(Journal article; Peer reviewed, 2015)We discover that the multiple degrees of freedom associated with magnetic skyrmions—size, position, and helicity—can all be used to control the Josephson effect and 0 − π transitions occurring in superconductor/magnetic ... -
Long-ranged triplet supercurrent in a single in-plane ferromagnet with spin-orbit coupled contacts to superconductors
(Journal article; Peer reviewed, 2019)By converting conventional spin-singlet Cooper pairs to polarized spin-triplet pairs, it is possible to sustain long-ranged spin-polarized supercurrents flowing through strong ferromagnets. Obtaining such a conversion via ... -
Magnetization dynamics and Majorana fermions in ferromagnetic Josephson junctions along the quantum spin Hall edge
(Journal article; Peer reviewed, 2011)We investigate the interplay between ferromagnetic and superconducting order at the edge of a quantum spin Hall insulator. Using complementary analytical and self-consistent numerical approaches, we study a ferromagnetic ... -
Majorana fermions in spin-orbit-coupled ferromagnetic Josephson junctions
(Journal article; Peer reviewed, 2011)We study all possible Majorana modes in two-dimensional spin-orbit-coupled ferromagnetic superconductor–normal state–superconductor (SNS) Josephson junctions and propose experiments to detect them. With the S region in a ... -
Majorana fermions manifested as interface states in semiconductor hybrid structures
(Journal article; Peer reviewed, 2010)Motivated by recent proposals for the generation of Majorana fermions in semiconducting hybrid structures, we examine possible experimental fingerprints of such excitations. Whereas previous works mainly have focused on ...