The new beam at PSI: A hybrid-type large acceptance channel for the generation of a high intensity surface-muon beam

Prokscha, T.; Morenzoni, E.; Deiters, K.; Foroughi, F.; George, David C.; Kobler, R.; Suter, A.; Vranković, V.

doi:10.1016/j.nima.2008.07.081

Cited by 203 publications

(160 citation statements)

References 21 publications

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“…The aptly named LE-μSR spectrometer has been successful in providing a beam of muons that can be routinely used for depth-dependent investigations on the nanometre scale 30,31 .…”

Section: Methodsmentioning

confidence: 99%

Direct measurement of the electronic spin diffusion length in a fully functional organic spin valve by low-energy muon spin rotation

et al. 2008

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Electronic devices that use the spin degree of freedom hold unique prospects for future technology. The performance of these 'spintronic' devices relies heavily on the efficient transfer of spin polarization across different layers and interfaces. This complex transfer process depends on individual material properties and also, most importantly, on the structural and electronic properties of the interfaces between the different materials and defects that are common to real devices. Knowledge of these factors is especially important for the relatively new field of organic spintronics, where there is a severe lack of suitable experimental techniques that can yield depth-resolved information about the spin polarization of charge carriers within buried layers of real devices. Here, we present a new depth-resolved technique for measuring the spin polarization of current-injected electrons in an organic spin valve and find the temperature dependence of the measured spin diffusion length is correlated with the device magnetoresistance.R ecently great efforts have been undertaken to use the spin degree of freedom in electronic devices. These activities are fuelled by the potential prospects of spin-electronic (or 'spintronic') devices for example in terms of increased processing speed and integration, non-volatility, reduced power consumption, multifunctionality and their suitability for quantum computing 1 . The most common method for using the spin in devices is based on the alignment of the electron spin ('up' or 'down') relative to either a reference magnetic field or the magnetization orientation of a ferromagnetic layer. Device operation normally proceeds with measuring a quantity such as the electrical current that depends on how the degree of spin alignment is transferred across the device. The so-called 'spin valve' is a prominent example of such a spin-enabled device that has already revolutionized hard-drive read heads and magnetic memory 1 . The efficient transfer of spin polarization in real device structures remains one of the most difficult challenges in spintronics, because it is dependent on more than just the properties of the individual materials that comprise the device.Recently 2,3 , the use of organic materials in spintronics has become of significant interest, primarily owing to their ease and small cost of processing and electronic and structural flexibility. Furthermore, the extremely long spin coherence times found in organic materials offer considerable advantages over other materials 3 . This favourable property is related to two factors, first the weak spin-orbit coupling of light elements such as carbon and second to the small nuclear hyperfine interaction 4,5 . The latter arises because the electron transport in π-conjugated molecules is normally confined to molecular states, delocalized to the carbon rings, the predominant isotope of which, 12 C, has zero nuclear spin 4 .A common way to measure spin diffusion is based on time-resolved optical techniques, where spin-polarized charge carrie...

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“…The aptly named LE-μSR spectrometer has been successful in providing a beam of muons that can be routinely used for depth-dependent investigations on the nanometre scale 30,31 .…”

Section: Methodsmentioning

confidence: 99%

Direct measurement of the electronic spin diffusion length in a fully functional organic spin valve by low-energy muon spin rotation

et al. 2008

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“…Muon-spin relaxation and rotation (μSR) measurements were carried out using the low-energy muon spectrometer at the μE4 beamline of the Paul Scherrer Institut (PSI, Switzerland) [16]. In μSR experiments spin-polarized positive muons are implanted into a sample and thermalized.…”

Section: Methodsmentioning

confidence: 99%

Spin-phonon coupling in epitaxialSr0.6Ba0.4MnO3thin films

et al. 2017

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Spin-phonon coupling is investigated in epitaxially strained Sr 1−x Ba x MnO 3 thin films with perovskite structure by means of microwave (MW) and infrared (IR) spectroscopy. In this work we focus on the Sr 0.6 Ba 0.4 MnO 3 composition grown on (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 substrate. The MW complex electromagnetic response shows a decrease in the real part and a clear anomaly in the imaginary part around 150 K. Moreover, it coincides with a 17% hardening of the lowest-frequency polar phonon seen in IR reflectance spectra. In order to further elucidate this phenomenon, low-energy muon-spin spectroscopy was carried out, signaling the emergence of antiferromagnetic order with Néel temperature (T N ) around 150 K. Thus, our results confirm that epitaxial Sr 0.6 Ba 0.4 MnO 3 thin films display strong spin-phonon coupling below T N , which may stimulate further research on tuning the magnetoelectric coupling by controlling the epitaxial strain and chemical pressure in the Sr 1−x Ba x MnO 3 system.

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“…The majority of the muon measurements were performed at the SµS, Paul Scherrer Institut, Switzerland using the LEM instrument [6][7][8][9], additional bulk reference measurements were made using 3.7 MeV µ + surface muons using the GPS and DOLLY instruments at PSI and the ARGUS spectrometer at ISIS. The low energy muons are gener-ated by moderation of the high intensity polarised beam of surface µ + using a thin film of Ar held at 10 K. Electrostatic elements are used to extract epithermal muons with energy ∼15 eV and accelerate them up to 20 keV for transportation to the sample target where they are slowed down to provide a implantation energy that can be continuously varied from below 1 keV to values up to ∼30 keV.…”

Section: Instrumentmentioning

confidence: 99%

Nanoscale depth-resolved polymer dynamics probed by the implantation of low energy muons

Pratt

Lancaster

Baker

et al. 2016

Polymer

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(2016) 'Nanoscale depth-resolved polymer dynamics probed by the implantation of low energy muons. ', Polymer., Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe low energy muon (LEM) technique has been used to probe local changes in the dynamical spectrum of thin film polymer samples taking place as a function of the temperature and the implantation depth below the free surface. The studies have been made on samples of polydimethylsiloxane (PDMS) and polybutadiene (PB) using the transverse magnetic field (TF) configuration and diamagnetic probe muons. In PDMS evidence is found for suppression of the glass transition temperature near the surface, along with significantly modified dynamics in the near-surface region as well as at depths significantly below the surface. For PB the LEM technique reveals well-defined layers of dynamical and spatial inhomogeneity at depths of order 0.1 to 0.2 µm below the free surface. These inhomogeneous regions may be assigned to nanopores produced by solvent streaming during preparation of spin-cast films. A thermal annealing procedure is shown to significantly reduce the thickness of these inhomogeneous layers. These results demonstrate that using LEM in the TF configuration provides a promising new method for studying surface-modified local dynamics of polymers that is also able to reveal nanostructured buried layers in polymer films.

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The new beam at PSI: A hybrid-type large acceptance channel for the generation of a high intensity surface-muon beam

Cited by 203 publications

References 21 publications

Direct measurement of the electronic spin diffusion length in a fully functional organic spin valve by low-energy muon spin rotation

Direct measurement of the electronic spin diffusion length in a fully functional organic spin valve by low-energy muon spin rotation

Spin-phonon coupling in epitaxialSr0.6Ba0.4MnO3thin films

Nanoscale depth-resolved polymer dynamics probed by the implantation of low energy muons

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