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• (author = "Wong, K" AND subject = "Condensed Matter - Materials Science")
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author = "Wong, K" > : "Condensed Matter - Materials Science" (x)
1

Found 4 documents, displaying page 1 of 1

Search for incoherent tunnel fluctuations of the magnetisation in nanoparticles of artificial ferritin

Author(s) : Gilles, C. , Bonville, P. , Wong, K. K. W. , Mann, S.
Description : The magnetic behaviour of nanoparticles of antiferromagnetic ferritin, with a mean Fe loading of 410 atoms per core, has been investigated by 57Fe Mossbauer absorption spectroscopy down to very low temperature (34mK). In previous experi- ments of frequency dependent magnetic susceptibility and mag...
Repository : arXiv
Language(s) : Undetermined

Study on the oxygen isotope effect in A-site ordered manganite $R$BaMn$_{2}$O$_{6}$ ($R$ = La, Pr, Nd, Sm)

Author(s) : Wang, G. Y. , Wong, K. H. , Wang, Y.
Description : A-site ordered manganites $R$BaMn$_{2}$O$_{6}$ ($R$ = La, Pr, Nd, Sm) were synthesized and the oxygen isotope effect in them was studied. It was found that the substitution of $^{16}$O by $^{18}$O has caused increases in both the Neel temperature ($T$$_{N}$) and the charge ordering temperature ($T...
Repository : arXiv
Language(s) : Undetermined

Non-Langevin behaviour of the uncompensated magnetisation in nanoparticles of artificial ferritin

Author(s) : Gilles, C. , Bonville, P. , Wong, K. K. W. , Mann, S.
Description : The magnetic behaviour of nanoparticles of antiferromagnetic ferritin has been investigated by 57Fe Mossbauer absorption spectroscopy and magnetisation measurements, in the temperature range 2.5K-250K and with magnetic fields up to 7T. Samples containing nanoparticles with an average number of Fe ...
Repository : arXiv
Language(s) : Undetermined

Unification of bulk and interface electroresistive switching in oxide systems

Author(s) : Ruotolo, A. , Leung, C. W. , Lam, C. Y. , Cheng, W. F. , Wong, K. H. , Pepe, G. P.
Description : We demonstrate that the physical mechanism behind electroresistive switching in oxide Schottky systems is electroformation, as in insulating oxides. Negative resistance shown by the hysteretic current-voltage curves proves that impact ionization is at the origin of the switching. Analyses of the c...
Repository : arXiv
Language(s) : Undetermined
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Found 4 documents, displaying page 1 of 1