307 citations · 889 across the 25 of their papers we have counts for
25 papers
Radar shielding experiments by composite bilayer magnetic systems
Jaume Calvo-de la Rosa, Jesús López-Sánchez, Joan Manel Hernàndez +2
An experimental strong increase of the reflection loss (from 25 up to 35 dBs) and an extension of the absorption bandwidth up to 20% is measured in a set of novel functional bilaye…
Microwave absorption in barium hexaferrite nanocomposites with random anisotropy
Jaume Calvo-de la Rosa, Antoni García-Santiago, Joan Manel Hernàndez +3
This work reports experimental evidence of random magnetic behavior observed in modified barium hexagonal ferrites. We observe a significant transition in the magnetic properties o…
Resonant and off-resonant magnetoacoustic waves in epitaxial FeSi/GaAs hybrid structures
Marc Rovirola, M. Waqas Khaliq, Blai Casals +6
Surface acoustic waves (SAWs) provide an efficient dynamical coupling between strain and magnetization in micro/nano-metric devices. Using a hybrid device composed of a piezoelectr…
Effects of the Zhang-Li Torque on Spin Torque nano Oscillators
Jan Albert, Ferran Macià, Joan Manel Hernàndez
Spin-torque nano-oscillators (STNO) are microwave auto-oscillators based on magnetic resonances having a nonlinear response with the oscillating amplitude, which provides them with…
Generation and imaging of magnetoacoustic waves over millimetre distances
Blai Casals, Nahuel Statuto, Michael Foerster +7
Using hybrid piezoelectric/magnetic systems we have generated large amplitude magnetization waves mediated by magneto-elasticity with up to 25 degrees variation in the magnetizatio…
Generation and stability of dynamical skyrmions and droplet solitons
Nahuel Statuto, Joan Manel Hernàndez, Andrew D. Kent +1
A spin-polarized current in a nanocontact to a magnetic film can create collective magnetic oscillations by compensating the magnetic damping. In particular, in materials with unia…
Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer
Carla Cirillo, Stefano Voltan, Katsiaryna Ilyina +4
Odd-frequency triplet Cooper pairs are believed to be the carriers of long-range superconducting correlations in ferromagnets. Such triplet pairs are generated by inhomogeneous mag…
Simultaneous imaging of strain waves and induced magnetization dynamics at the nanometer scale
Michael Foerster, Ferran Macià, Nahuel Statuto +8
Changes in strain can be used to modify electronic and magnetic properties in crystal structures, to manipulate nanoparticles and cells, or to control chemical reactions. The magne…
Effect of temperature on spin-transfer torque induced magnetic solitons
Sergi Lendínez, Jinting Hang, Saül Vélez +4
Spin-transfer torques in a nanocontact to an extended magnetic film can create spin waves that condense to form dissipative droplet solitons. Here we report an experimental study o…
Thickness and temperature dependence of the magnetodynamic damping of pulsed laser deposited on (111)-oriented SrTi
Vegard Flovik, Ferran Macià, Sergi Lendínez +4
We have investigated the magnetodynamic properties of (LSMO) films of thickness 10, 15 and 30 nm grown on (111)-oriented SrTi$\text{O}_…
Tailoring the magnetodynamic properties of nanomagnets using magnetocrystalline and shape anisotropies
Vegard Flovik, Ferran Macià, Joan Manel Hernàndez +3
Magnetodynamical properties of nanomagnets are affected by the demagnetizing fields created by the same nanoelements. In addition, magnetocrystalline anisotropy produces an effecti…
Direct observation and imaging of a spin-wave soliton with like symmetry
S. Bonetti, R. Kukreja, Z. Chen +12
The prediction and realization of magnetic excitations driven by electrical currents via the spin transfer torque effect, enables novel magnetic nano-devices where spin-waves can b…
Magnetic properties of double exchange biased diluted magnetic alloy/ferromagnet/antiferromagnet trilayers
Carla Cirillo, Antoni Garcia-Santiago, Joan Manel Hernandez +2
The magnetic properties of trilayers consisting of a diluted magnetic alloy, CuMn (Cu0.99Mn0.01), a soft ferromagnet, Py(Ni0.8Fe0.2), and an antiferromagnet, alpha-Fe2O3, were inve…
Quantum depinning of the magnetic vortex core in micron-size permalloy disks
Ricardo Zarzuela, Saül Vélez, Joan Manel Hernandez +2
The vortex state, characterized by an in-plane closed flux domain structure and an out-of-plane magnetization at its centre (the vortex core), is one of the magnetic equilibria of…
Anisotropic magnetic deflagration in single crystals of Gd5Ge4
S. Vélez, J. M. Hernandez, A. García-Santiago +6
Experimental evidence of the anisotropy of the magnetic deflagration associated with the low-temperature first order antiferromagnetic (AFM) --> ferromagnetic (FM) phase-transition…
The role of temperature in the magnetic irreversibility of type-I Pb superconductors
Saül Vélez, Antoni García-Santiago, Joan Manel Hernandez +1
Evidence of how temperature takes part in the magnetic irreversibility in the intermediate state of a cylinder and various disks of pure type-I superconducting lead is presented. I…
Quantum Tunneling of Normal-Superconducting Interfaces in a Type-I Superconductor
E. M. Chudnovsky, S. Velez, A. Garcia-Santiago +2
Evidence of a non-thermal magnetic relaxation in the intermediate state of a type-I superconducor is presented. It is attributed to quantum tunneling of interfaces separating norma…
Comment on "Magnetic Relaxations of Antiferromagnetic Nanoparticles in Magnetic Fields"
E. del Barco, M. Duran, J. M. Hernandez +1
We have carried out in ferritin the Field-Cooling method and data analysis proposed by Mamiya et al. (Phys. Rev. Lett. 88, 67202 (2002) at T = 5 K in order to check the time magnet…
Crystal defects and spin tunneling in single crystals of Mn12 clusters
J. M. Hernandez, F. Torres, E. Molins +1
The question addressed in this paper is that of the influence of the density of dislocations on the spin tunneling in Mn12 clusters. We have determined the variation in the mosaici…
Relaxation and Landau-Zener experiments down to 100 mK in ferritin
M. Duran, E. del Barco, J. M. Hernandez +1
Temperature-independent magnetic viscosity in ferritin has been observed from 2 K down to 100 mK, proving that quantum tunneling plays the main role in these particles at low tempe…
Millikelvin magnetic relaxation measurements of alpha-Fe2O3 antiferromagnetic particles
E. del Barco, J. M. Hernandez, M. Duran +4
In this paper we report magnetic relaxation data for antiferromagnetic alpha-Fe2O3 particles of 5 nm mean diameter in the temperature range 0.1 K to 25 K. The average spin value of…
Giant and time-dependent magnetocaloric effect in high-spin molecular magnets
F. Torres, J. M. Hernandez, X. Bohigas +1
We have measured and calculated the magnetocaloric effect in macroscopic samples of oriented high-spin molecular clusters like Mn12 and Fe8 as a function of the temperature and bot…
Magnetic qubits as hardware for quantum computers
J. Tejada, E. M. Chudnovsky, E. del Barco +2
We propose two potential realisations for quantum bits based on nanometre scale magnetic particles of large spin S and high anisotropy molecular clusters. In case (1) the bit-value…
High frequency resonant experiments in Fe molecular clusters
E. del Barco, J. M. Hernandez, J. Tejada +5
Precise resonant experiments on Fe magnetic clusters have been conducted down to 1.2 K at various tranverse magnetic fields, using a cylindrical resonator cavity with 40 diff…