5th workshop on scientific collaboration/JINR/Dubna HJL Basis HFR IBR-2 user policy collaboration Project REMUR: Investigation of the structure of nano-objects in films of magnetic and nonmagnetic materials including new Larmor precession devices Project Spin-Echo: Feasibility study of time-of-flight spin echo spectrometer at IBR-2. Project EPSILON/SKAT: Investigation of strain/stress and texture on geological samples Project YuMO: Investigation of nano - and mesostructures via small-angle neutron scattering Neutrons at IBR-2 User meeting, June 2004, at FLNP/JINR Projet leader meeting, October 2004, at Uni Goettingen

5th workshop on scientific collaboration/JINR/Dubna HJL Project DN-12: Neutron studies of microsamples under high pressure Project FSD: Internal stresses in functional materials studied by the high resolution Fourier neutron diffraction technique Project: DAQ and CI - Development of Data Acquisition Systems and Computing Infrastructure for the IBR-2 spectrometer complex. Project: Gas Neutron detectors

5th workshop on scientific collaboration/JINR/Dubna HJL Advanced Reflectometry with Larmor Precession Nanoscience Biology Horizontal Reflectometer Angular and Energy Encoding

5th workshop on scientific collaboration/JINR/Dubna HJL stripe arrays Nano-structures: needs for nano-characterization imbedded nanoparticles in polymer matrix magnetic multilayer films MONITORING of the INTERNAlL STRUCTURE in VARIOUS NANOSYSTEMS multilamellar vesicles for biochemical applications buried quantum dots Nanowires in mesoporous silica

5th workshop on scientific collaboration/JINR/Dubna HJL Nano-structures “as seen” by neutrons MONITORING of the INTERNAlL STRUCTURE in VARIOUS NANOSYSTEMS multilamellar vesicles for biochemical applications stripe arrays imbedded nanoparticles in polymer matrix magnetic multilayer films buried quantum dots Information about the transverse and lateral structure (magnetic and non-magnetic) is encoded in the 2D scattered intensity -> comprehensive data analysis is needed Nanowires in mesoporous silica

5th workshop on scientific collaboration/JINR/Dubna HJL Sample Precession magnetic fields (solenoids) Polarizer (supermirror, Heusler) Polarization analyzer Detector The principle of Neutron Spin Echo

5th workshop on scientific collaboration/JINR/Dubna HJL The principle of Neutron Spin Echo Sample

5th workshop on scientific collaboration/JINR/Dubna HJL Larmor precession angle   L l H/ v n  L =2.916 kHz/Oe Larmor precession for encoding and  vnvn Sample position outside ( s1 ) or inside ( s2 ) LP-device n polarized neutrons S1S2 Magnetic field H   l Current sheets DetectorAnalyzer and  ( s1 ) sensitive to and  ( s2 ) H perpendicular to P; scattering f(M) ( s3 ) divergent incoming beam for GISANS Pulsed white beam

5th workshop on scientific collaboration/JINR/Dubna HJL Reflected Direct D et. Analyzer Sample LP-device Res. spin flipper Reflected beam Direct beam H Encoding of with LP-device Top view Polymerfilm sample

5th workshop on scientific collaboration/JINR/Dubna HJL *direct and reflected beams in phase* Spin-asymmetry SA = (I + -I - )/(I + +I - ) H = 20Oe l = 0.473m Encoding of with LP-device spin up D et. Analyzer Sample(after LP) LP-device Res. spin flipper Reflected beam Direct beam H H=18.8 Oe derived from oscillations Polymerfilm sample

5th workshop on scientific collaboration/JINR/Dubna HJL Encoding of with LP-device D et. Analyzer Sample LP-device Res. spin flipper Reflected beam Direct beam H H=18.8 Oe H=17.5 Oe Polymerfilm sample

5th workshop on scientific collaboration/JINR/Dubna HJL SA for H=17.5 OeSA for H=17.5 Oe and H=18.8 Oe SA (H=17.5 Oe) - SA(H=18.8 Oe) Encoding of as a function of H Polymerfilm sample

5th workshop on scientific collaboration/JINR/Dubna HJL Reflected Direct D et. Analyzer Sample LP-device Res. spin flipper Reflected beam Direct beam H Encoding of with LP-device--gain in intensity Top view Polymerfilm sample Incoming converging beamOverlapping but encoded signal

5th workshop on scientific collaboration/JINR/Dubna HJL Reflectometry with Larmor precession D et. Analyzer LP-device Res. spin flipper Reflected beam Direct beam H Sample Fe-Cr sample - “AF” ordered - near remanent field Fe-Cr multilayer sample inside LP-device

5th workshop on scientific collaboration/JINR/Dubna HJL Out-of-plane (and in-plane) Larmor precession M1M1 M2M2 Simultaneous measurement with in-plane and out-of-plane spin direction Access to out-of plane magnetisation and full depth profile of in-plane magnetisation Determination of the total magnetic moment and its direction Determination of the layer-by-layer magnetization magnetizatio n spin rotation axis

5th workshop on scientific collaboration/JINR/Dubna HJL Advanced Reflectometry with Larmor Precession Angular and Energy Encoding for Nanoscience REMUR equipment including neutron guide and cold moderator Reflex equipment (cold moderator) Biology-Horizontal Reflectometer Note:Study for investigation of 3rd co-ordinate (GISANS)

5th workshop on scientific collaboration/JINR/Dubna HJL Advanced Reflectometry with Larmor Precession V.Lauter-Pasyuk TU München W.Petry TU München M.Jernenkov ILL Grenoble H.J.Lauter ILL Grenoble A.Ioffe FZ Jülich T.Brückel FZ Jülich P.Schmiedel Uni Halle K.Jernenkov FLNP Dubna V.Bodnarchuk FLNP Dubna A.Petrenko FLNP Dubna V.Aksenov FLNP Dubna A.Belushkin FLNP Dubna

5th workshop on scientific collaboration/JINR/Dubna HJL Top view of IN3 with spin echo option ZETA B Heusler analyzer sample area 3 He detector Heusler monochrom. double RF-flippers (bootstrap coils) mumetal shield monitor counter PG-filter coupling coils 1 m Residual internal field ~ 5 mG. „Precession“ length - 55 cm Frequency range 50 – 750 KHz corresponds to effective fields 35 G – 1 KG

5th workshop on scientific collaboration/JINR/Dubna HJL Three axis spectrometer IN3 with spin echo option ZETA. The magnetic shields are opened to show the two flipper coils in each arm double RF-flippers (bootstrap coils)

5th workshop on scientific collaboration/JINR/Dubna HJL What does Neutron Spin Echo measure?