Investigation of Magnetic Ordering and Phase Transitions in Magnets by a Polarized-Neutron Method

Drabkin, G.M.; Gordeev, G. P.; Zabidarov, E. I.; Kasman, Ya. A.; Okorokov, A. I.; Trunov, V. A.

doi:10.1070/pu1974v017n03abeh004184

Cited by 9 publications

(10 citation statements)

References 2 publications

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“…The concept of non-adiabatic coil flippers was proposed by Hughes and Burgy [88] in the early 1950's. Appropriate field configurations achieved by mounting two dc coils with opposite polarity coaxially along the neutron beam were used by Drabkin et al [89] in the 1960's and by Jones and Williams [90] in the 1970's to spin-flip neutron beams. At the flipper entrance, the field is parallel to the momentum of the neutron.…”

Section: Neutron Spin Flippersmentioning

confidence: 99%

Polarized neutrons for pulsed neutron sources

Anderson¹,

Cook

Felcher³

et al. 2005

GNER

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Polarized neutrons provide a powerful tool for research at today's continuous neutron sources, permitting unique information to be obtained from neutron-scattering experiments and in the area of fundamental neutron physics. The information obtained is indispensable to important areas of current research such as magnetism, spin fluctuations in correlated-electron materials, nanoscience, astrophysics, and cosmology.Unfortunately, the polarized neutron capabilities that already exist at reactor neutron sources, mainly in Europe, cannot be transferred directly to pulsed spallation sources because many of the devices used at reactors to manipulate neutron spins operate only at a single neutron wavelength or with a neutron beam of limited divergence. Both of these restrictions must be overcome for devices to be useful at pulsed spallation sources. This report identifies the significant R&D efforts that will be required to achieve these goals. These efforts must be undertaken now, if they are to be useful early in the lifetime of the spallation neutron source (SNS) or its Japanese counterpart, Japanese proton accelerator research complex (J-PARC).A workshop on the use of polarized neutrons at pulsed neutron sources was held on February 10 -13,

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Section: Neutron Spin Flippersmentioning

confidence: 99%

Polarized neutrons for pulsed neutron sources

Anderson¹,

Cook

Felcher³

et al. 2005

GNER

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“…The phenomenon of neutron spin precession in a transverse magnetic field [1,2] is a cornerstone of the NSE technique. The neutron spin S that makes an angle of 90…”

Section: Modulation Of the Neutron Beam Spectrum By The Neutron Spin mentioning

confidence: 99%

Neutron Speed Echo Spectroscopy

Ioffe

2002

Neutron Spin Echo Spectroscopy

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Abstract. Neutron speed echo (NSPE) technique is in a way a generalization of the neutron spin echo (NSE) technique. Similar to NSE spectrometers, the resolution of such NSPE spectrometer is extremely high and is not connected with the monochromatization of the incoming beam. However, in contrast to NSE spectrometers, the operation of proposed spectrometer does not necessarily require a polarized neutron beam. Such decoupling the polarization and the resolution is in clear contrast to NSE technique. Because the resolution of a NSPE spectrometer can be a few orders higher than the resolution of NSE spectrometers, one can achieve the energy resolution of about 10 −14 eV by the use of ultra cold neutrons; a fact that can be used in some fundamental physics experiments. Though the scattering on the sample impose limitations on the resolution of a NSPE spectrometer, the use of the proposed technique in a low-resolution mode can be useful in the combination with triple-axis spectrometers and allow for the significant improvement of their energy resolution, however, without the use of polarized neutrons. This fact opens new possibilities for the study of magnetic phenomena in solids, where the NSE method is principally not applicable because of the neutron precession in the sample, especially by combining polarization analysis with high-resolution spectroscopy. The proposed technique also allows for an easy implementation of the principle of the NSE focusing, when the resolution ellipse is aligned along a dispersion curve.

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“…When one writes down expressions that connect the quantities one measures (x yz spin flip and non spin flip cross sections) and the quantities one is interested in (the nuclear coherent scattering N , nuclear spin-incoherent a e-mail: ehlersg@ornl.gov scattering I , and magnetic scattering M), it turns out that some terms accidentally cancel if the scattering occurs in the x y plane ( Q ⊥ z). As the use of the method can be traced back to the 60s [16,17], this condition was always met, simply because neutron scattering instrumentation was nearly always confined to the x y plane. At a modern TOF instrument this is no longer true, and it is therefore worth going back to the basics of the technique and to develop the measurement protocol further, in particular to achieve a cleaner separation of M.…”

Section: Introductionmentioning

confidence: 99%

Neutronxyz– polarization analysis at a time-of-flight instrument

Ehlers

Stewart

Deen

et al. 2015

EPJ Web of Conferences

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Abstract. When implementing a dedicated polarization analysis setup at a neutron time-of-flight instrument with a large area detector, one faces enormous challenges. Nevertheless, significant progress has been made towards this goal over the last few years. This paper addresses systematic limitations of the traditional method that is used to make these measurements, and a possible strategy to overcome these limitations. This will be important, for diffraction as well as inelastic experiments, where the scattering occurs mostly out-of-plane.

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Investigation of Magnetic Ordering and Phase Transitions in Magnets by a Polarized-Neutron Method

Cited by 9 publications

References 2 publications

Polarized neutrons for pulsed neutron sources

Polarized neutrons for pulsed neutron sources

Neutron Speed Echo Spectroscopy

Neutronxyz– polarization analysis at a time-of-flight instrument

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