Výsledky vyhledávání - "Johnstone, G."

Akademický článek

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Order-disorder type critical behaviour at the magnetoelectric phase transition in multiferroic DyMnO$_3$

Autor: Schiebl, M., Shuvaev, A., Pimenov, Anna, Johnstone, G. E., Dziom, V., Mukhin, A. A., Ivanov, V. Yu., Pimenov, A.

Publikováno v: Phys. Rev. B 91, 224205 (2015)

We present the results of detailed dielectric investigations of the relaxation dynamics in DyMnO$_3$ multiferroic manganite. Strong low-frequency relaxation process near the paraelectric-ferroelectric phase transition is observed. The high frequency

Externí odkaz: http://arxiv.org/abs/1505.07949

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Ground state in a half-doped manganite distinguished by neutron spectroscopy

Autor: Johnstone, G. E., Perring, T. G., Sikora, O., Prabhakaran, D., Boothroyd, A. T.

Publikováno v: Phys. Rev. Lett. 109, 237202 (2012)

We have measured the spin-wave spectrum of the half-doped bilayer manganite Pr(Ca,Sr)2Mn2O7 in its spin, charge, and orbital ordered phase. The measurements, which extend throughout the Brillouin zone and cover the entire one-magnon spectrum, are com

Externí odkaz: http://arxiv.org/abs/1210.7108

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The Magnetic Structure of DyMn2O5 Determined by Resonant X-ray Scattering

Autor: Johnstone, G. E., Ewings, R. A., Johnson, R. D., Mazzoli, C., Walker, H. C., Boothroyd, A. T.

Resonant magnetic x-ray scattering has been used to investigate the magnetic structure of the magnetoelectric multiferroic DyMn2O5. We have studied the magnetic structure in the ferroelectric phase of this material, which displays the strongest ferro

Externí odkaz: http://arxiv.org/abs/1205.4920

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Dissertation/ Thesis

An investigation into filters utilising coupled transmission lines

Autor: Johnstone, G. G.

This thesis addresses itself to the solution of a number of problems which arise in the development of Radio Frequency filters, particularly those involving coupled transmission lines as resonant elements. The text is divided into a number of section

Externí odkaz: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308471

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