Ultrasoft magnetic films investigated with Lorentz tranmission electron microscopy and electron holographyстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Ultrasoft magnetic films investigated with lorentz tranmission electron microscopy and electron holography / J. T. De Hosson, N. G. Chechenin, D. H. Alsem et al. // Microscopy and Microanalysis. — 2002. — Vol. 8, no. 4. — P. 274–287. As a tribute to the scientific work of Professor Gareth Thomas in the field of structure-property relationships this paper delineates a new possibility of Lorentz transmission electron microscopy (ITEM) to study the magnetic properties of soft magnetic films. We show that in contrast to the traditional point of view, not only does the direction of the magnetization vector in nano-crystalline films make a correlated small-angle wiggling, but also the magnitude of the magnetization modulus fluctuates. This fluctuation produces a rapid modulation in the ITEM image. A novel analysis of the ripple structure in nano-crystalline Fe-Zr-N film corresponds to an amplitude of the transversal component of the magnetization DeltaM(y) of 23 mT and a longitudinal fluctuation of the magnetization of the order of DeltaM(x) = 30 mT. The nano-crystalline (Fe99Zr1)(1-x)N-x films have been prepared by DC magnetron reactive sputtering with a thickness between 50 and 1000 nm. The grain size decreased monotonically with N content from typically 100 nm in the case of N-free films to less than 10 nm for films containing 8 at%. The specimens were examined with a JEOL 2010F 200 kV transmission electron microscope equipped with a post column energy filter (GIF 2000 Gatan Imaging Filter). For holography, the microscope is mounted with a biprism (JEOL biprism with a 0.6 mum diameter platinum wire). [ DOI ]

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