Browsing by Author "D’Adam, TM"

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    ACNS sample environment update
    (Australian Institute of Nuclear Science and Engineering (AINSE), 2020-11-11) D’Adam, TM
    The sample environment suite at ACNS has continued to grow. In the last year we have successfully commissioned our new helium dilution cryostat and the 7T magnet. The magnet has brought important capability for experiments requiring magnetic field to Pelican. We will talk about these new capabilities, how to get the best out of our suite of equipment and some recent unique and interesting sample environment set ups. We will also launch our handbook, covering everything you need to know about our equipment. We have a number of exciting projects coming up to show you. We are currently working on Direct Laser Melting (DLM) deposition system co-funded by a NSW RAAP grant. Also underway are LIEF grants with equipment for use at ACNS, one includes a rheometer for use on ACNS beam instruments. In the middle of 2021 we will receive funding to replace our older equipment. The NCRIS RIIP scheme will fund new cryofurnaces, a new type of furnace, a uniaxial press and other equipment. © The Author
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    Application of linear spin wave theory to the Cr8 antiferromagnetic Heisenberg Ring
    (Australian Institute of Nuclear Science and Engineering, 2016-11-29) D’Adam, TM; Mole, RA; Stride, JA
    The investigation of single molecule magnets (SMMs) has proven to be a focal point of magnetism research for over three decades, leading to the discovery of structures which may find applications in data storage, quantum information processing (QIP) and spintronics. Though molecular magnetism is not a new field, there are still many complexes to investigate and understand, including a range chains, rings, discs and cages. Amongst the considerable number of structures, particular interest has been shown to antiferromagnetic Heisenberg rings (AFHR) such as Cr8, CsFe8 and Fe18. These structures have been investigated due to their interesting magnetic behaviours which include quantum tunnelling of the Neel vector (QTNV) and a long magnetic relaxation time below their blocking temperature TB [1]. The Cr8 homometallic AFHR is one of the most well understood structures of its type having been extensively investigated since its initial synthesis using techniques including high-field EPR, cantilever torque magnetometry [2] and INS [3]. Through application of Linear Spin Wave Theory (LSWT) using the SpinW Matlab library [4] it has been possible to calculate the dynamic structure factor of the Cr8 ring; this agrees well with both the INS data collected for this structure as well as models produced using alternate methods [3]. This demonstrates that LSWT is applicable to the Cr8 ring and we plan to use this method to analyse more complex structures which also do not exhibit long range magnetic ordering.
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    Development of Direct Laser Melting (DLM) deposition system for in-situ use on neutron beam instruments
    (Australian Institute of Nuclear Science and Engineering (AINSE), 2020-11-11) Baldwin, C; White, R; Paradowska, AM; Booth, N; Davidson, G; D’Adam, TM; Shumack, A; Darmann, F
    Direct Laser Melting (DLM) deposition is an additive manufacturing technique in which a high power laser is used to create a melt pool on a workpiece while a jet of metal powder is applied, resulting in localised material deposition. This technique is used in industry for additive repairs, cladding with dissimilar metals, or, in conjunction with a CNC milling machine, as a full-fledged 3D additive fabrication platform. As the prominence of this technology rises, so too does interest in characterising deposition dynamics over a vast parameter space. Neutron beam instruments offer unique capabilities for such characterisation. As part of the NSW Research Attraction and Acceleration Program, ACNS is developing world first sample environment capabilities enabling in-situ laser metal deposition, for use on KOWARI and DINGO beamline. The system will utilise a self-contained motion stage and laser cladding head which will construct a thin wall structure on a user specified substrate, utilising up to two metal powders at a time. Neutron studies of the melt pool or heat affected zone can then be performed during and after printing. This paper will present the technical specifications and capabilities of the system, which will be available to the user community in late 2021. © The authors.