Maximilian Kugler
16/06/2015, 12:40
Quantum phenomena
Short talk
A magnetic helix realizes a one-dimensional magnetic crystal with a period given by the pitch length. Its spin-wave excitations – the helimagnons – experience Bragg scattering off this periodicity leading to gaps in the spectrum that inhibit their propagation along the pitch direction defined by the wavevector. Using high-resolution inelastic neutron scattering the resulting band structure of...
Alfonso Chacon
16/06/2015, 12:20
Quantum phenomena
Short talk
The topological stability of skyrmions in bulk samples of MnSi and the
observation of spin transfer torque effects at ultra-low current densities
have generated great interest in skyrmions in chiral magnets as a new
route towards next generation spintronics devices. Yet, the formation
of skyrmions in MBE grown thin films of MnSi reported in the literature
is highly controversial. We...
Mr
Erxi Feng
(Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH Outstation at MLZ)
16/06/2015, 11:40
Quantum phenomena
Short talk
Pyrochlore iridates and hafnates A2B2O7 (A= rare earth ion, B=Ir, Hf), in which both the A site and the B site consists of corner-shared tetrahedral, are of particular interest due to the presence of both strong spin-orbital coupling and geometrical frustration. Recently, we have successfully synthesized high quality powder samples of Nd2Ir2O7 and Nd2Hf2O7 which high quality powder samples...
Dr
Sultan Demirdis
(Forschungszentrum Julich GmbH, Julich Center for Neutron Science , JCNS at MLZ)
16/06/2015, 11:20
Quantum phenomena
Short talk
Small-angle neutron scattering reveals the presence of an ordered vortex solid phase in high quality optimally doped single crystalline (Ba1-xKx)Fe2As2. Vortex solid Bragg peaks are not described by the Bragg glass prediction. Simultaneously, the vortex solid structure factor shows a sharp drop as function of magnetic field, that is correlated with the second peak feature in isothermal...
Sebastian Muehlbauer
16/06/2015, 12:00
Quantum phenomena
Short talk
We present the implementation of the time resolved stroboscopic small angle neutron scattering technique TISANE at the SANS-1 instrument at MLZ. TISANE is based on the cyclic perturbation of the sample where the time-dependent response is measured. By means of a chopper system, a microsecond time-resolution can be achieved. We discuss existing applications and possible future perspectives for...
Kirill Nemkovskiy
16/06/2015, 11:00
Quantum phenomena
Short talk
We present an inelastic neutron scattering study of the influence of isoelectronic Tm substitution on the low-energy structure and temperature dependence of the dynamical magnetic response in (Yb,Tm)B12 solid solutions. Substantial changes have been observed in the spectral structure and temperature evolution of the Yb contribution to the inelastic response for a rather low content of magnetic...