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Cosmic strings in hematite

Professor Paolo G. Radaelli OSI

Dr Lee's Professor

Research theme

  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Oxide electronics
Paolo.Radaelli@physics.ox.ac.uk
Telephone: 01865 (2)70957
Clarendon Laboratory, room 111
  • About
  • Research
  • Publications

Prof Radaelli recognised with an MPLS "Excellent Supervisor" Award

Physics Award Winners
Prof Radaelli is one of the 5 Oxford Physicists recognised in the inaugural "Excellence in Research Supervision" award

Read the story at this link

Excellence in Research Supervision

Magnetic fan structures in Ba$_{0.5}$Sr$_{1.5}$Zn$_2$Fe$_{12}$O$_{22}$ hexaferrite revealed by resonant soft X-ray diffraction

ArXiv 1308.6419 (2013)

Authors:

Alexander J Hearmon, RD Johnson, TAW Beale, SS Dhesi, X Luo, S-W Cheong, P Steadman, Paolo G Radaelli

Abstract:

The hexaferrites are known to exhibit a wide range of magnetic structures, some of which are connected to important technological applications and display magnetoelectric properties. We present data on the low field magnetic structures stabilised in a Y-type hexaferrite as observed by resonant soft X-ray diffraction. The helical spin block arrangement that is present in zero applied magnetic field becomes fan-like as a field is applied in plane. The propagation vectors associated with each fan structure are studied as a function of field, and a new magnetic phase is reported. Mean field calculations indicate this phase should stabilise close to the boundary of the previously reported phases.
Details from ArXiV
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MnSb2O6: a polar magnet with a chiral crystal structure

Acta Crystallographica Section A: Foundations and advances International Union of Crystallography (IUCr) 69:a1 (2013) s623-s623

Authors:

RD Johnson, K Cao, LC Chapon, F Fabrizi, N Perks, P Manuel, JJ Yang, YS Oh, S-W Cheong, PG Radaelli
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ChemInform Abstract: Ba2YFeO5.5: A Ferromagnetic Pyroelectric Phase Prepared by Topochemical Oxidation.

ChemInform Wiley 44:30 (2013) no-no

Authors:

Kun Luo, Roger D Johnson, Thao T Tran, P Shiv Halasyamani, Paolo G Radaelli, Michael A Hayward
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MnSb2O6: A polar magnet with a chiral crystal structure

(2013)

Authors:

RD Johnson, K Cao, LC Chapon, F Fabrizi, N Perks, P Manuel, JJ Yang, YS Oh, S-W Cheong, PG Radaelli
More details from the publisher

MnSb2O6: A polar magnet with a chiral crystal structure

ArXiv 1306.3854 (2013)

Authors:

RD Johnson, K Cao, LC Chapon, F Fabrizi, N Perks, P Manuel, JJ Yang, YS Oh, S-W Cheong, PG Radaelli

Abstract:

Structural and magnetic chiralities are found to coexist in a small group of materials in which they produce intriguing phenomenologies such as the recently discovered skyrmion phases. Here, we describe a previously unknown manifestation of this interplay in MnSb2O6, a trigonal oxide with a chiral crystal structure. Unlike all other known cases, the MnSb2O6 magnetic structure is based on co-rotating cycloids rather than helices. The coupling to the structural chirality is provided by a magnetic axial vector, related to the so-called vector chirality. We show that this unique arrangement is the magnetic ground state of the symmetric-exchange Hamiltonian, based on ab-initio theoretical calculations of the Heisenberg exchange interactions, and is stabilised by out-of-plane anisotropy. MnSb2O6 is predicted to be multiferroic with a unique ferroelectric switching mechanism.
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