Oxide electronics

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CaBaCo$_4$O$_7$ : A ferrimagnetic pyroelectric

(2014)

Authors:

RD Johnson, K Cao, PG Radaelli
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Magnetically induced femtoscale strain modulations in HoMn2O5

Physical Review B American Physical Society (APS) 89:12 (2014) 125114

Authors:

C Vecchini, A Bombardi, LC Chapon, G Beutier, PG Radaelli, S Park, S-W Cheong
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Crystallography needs a governing body

Nature 505:7485 (2014) 607-609
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Policy: Crystallography needs a governing body.

Nature 505:7485 (2014) 607-609
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Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO3 multiferroic thin films

Physical Review B - Condensed Matter and Materials Physics 88:9 (2013)

Authors:

KI Doig, F Aguesse, AK Axelsson, NM Alford, S Nawaz, VR Palkar, SPP Jones, RD Johnson, RA Synowicki, J Lloyd-Hughes

Abstract:

Coherent magnons and acoustic phonons were impulsively excited and probed in thin films of the room temperature multiferroic Bi1-x-yDy xLayFeO3 using femtosecond laser pulses. The elastic moduli of rhombohedral, tetragonal, and rare-earth doped BiFeO 3 were determined from acoustic-mode frequencies in conjunction with spectroscopic ellipsometry. A weak ferromagnetic order, induced alternately by magnetization in the growth direction or by tetragonality, created a magnon oscillation at 75 GHz, indicative of a Dzyaloshinskii-Moriya interaction energy of 0.31 meV. © 2013 American Physical Society.
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