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| John M. Cadogan
BSc Monash, PhD UNSW, MAIP
Professor
Department and Research Groups
Magnetic
Materials
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Research Interests
Our work involves the investigation of the magnetic behaviour and magnetic structures of a variety of materials using techniques such as 57Fe Mössbauer spectroscopy, neutron diffraction and depolarisation, muon spin relaxation (mSR), ac-susceptometry and thermal analysis (thermogravimetry and differential scanning calorimetry). We study both crystalline, nanocrystalline and amorphous materials including:
(i) rare-earth (R) intermetallics,
(ii) Fe-based spin-glasses and nanocomposites and
Most of the samples in (i) and (ii) are prepared at UNSW using a combination of argon-arc melting and melt-spinning.
Our work is predominantly experimental, with much work being carried out at major facilities both here in Australia (HIFAR nuclear reactor, Lucas Heights) and Overseas (nuclear reactors in Chalk River, Canada, and Berlin, Germany). Our mSR work is carried out at the TRIUMF cyclotron (the world's largest) in Vancouver, Canada.
We are also carrying out computer modelling of the magnetic exchange and crystal field interactions in R-Fe based intermetallics in an attempt to understand the many temperature-driven spin-reorientations (i.e. changes in the magnetic structure) and nuclear hyperfine interactions exhibited by some of these compounds.
Selected Publications
- The magnetic structure of ErFe11.5Ta0.5 J.M. Cadogan, D.H. Ryan, I.P. Swainson and R. Gagnon J. Phys. Condensed Matter 11 8975-8980 (1999)
- µSR study of transverse spin freezing in a-Fe90Zr10 D.H. Ryan, J.M. Cadogan and J. van Lierop Physical Review B 61 6816-6820 (2000)
- Effect of exchange-field penetration on residual amorphous phase in nanocrystalline Fe92Zr8 K. Suzuki and J.M. Cadogan J. Appl. Phys. 87 7097-7099 (2000)
- Neutron diffraction and Mössbauer study of the magnetic structure of YFe6Sn6 J.M. Cadogan, Suharyana, D.H. Ryan, O. Moze and W. Kockelmann J. Appl. Phys. 87 6046-6048 (2000)
- Magnetic properties of transition-metal doped a-Fe90Zr10 D.H. Ryan and J.M. Cadogan J. Magn. Magn. Mater. 213 111-116 (2000)
- Transverse spin freezing in a-Fe90Zr10 studied by µSR D.H. Ryan, J.M. Cadogan and J. van Lierop J. Appl. Phys. 87 6525-6527 (2000)
- Transverse spin freezing in ruthenium-doped a-Fe90Zr10 D.H. Ryan, J.M. Cadogan and J. van Lierop Physical Review B 62 8638-8641 (2000)
- Neutron diffraction study of the magnetic structure of DyFe6Ge6 J.M. Cadogan, D.H. Ryan and I.P. Swainson J. Phys. Condensed Matter 12 8963-8971 (2000)
Contact Details
Mail Address
School of Physics
The University of New South Wales
SYDNEY 2052
Australia
Email Address
Phone Number
Facsimile Number
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