Modifications of structure and magnetism of Ce/Fe multilayers induced by irradiation with low-energy Ar ions

Thiele, J.-U.; Klose, F.; Schulte, O.; Schurian, A.; Felsch, W.

doi:10.1016/0169-4332(93)90655-u

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…Ryan and co-workers [25][26][27] found that iron-rich amorphous alloys have an iron moment of 1.7 µ B with an asperomagnetic spin structure. It should be noted that the magnetization of the amorphous Fe in our experiment is different from that reported by Kragermann et al [9], Dubowik and Stobiecki [10], Thiele et al [11] and Cowlam and Carr [30] in that the film with amorphous Fe exhibited paramagnetic behaviour at room temperature. The divergence of magnetization could be attributed to the average chemical composition of the films and deposition techniques [16,31], which resulted in the change of the average Fe atomic distance under different experimental conditions.…”

Section: Discussioncontrasting

confidence: 93%

“…From figures 6-8, it was also found that, for all t F e 2.2 nm films, the as-deposited Fe layer was of the amorphous structure, and it transformed into the bcc Fe phase when t F e 3.2 nm. Similar results have been obtained in Fe/hcp metal (Gd, Zr, Ce) multilayers by some authors [9][10][11]21].…”

Section: The Microstructure Of the Filmssupporting

confidence: 89%

“…In recent studies, some metastable Fe phases were obtained in some Fe-based films, e.g. Fe was grown epitaxially in an fcc structure on Cu single crystals [6]; the fcc Fe phase was formed in many Fe/fcc metal multilayers when the Fe layer was very thin [7,8]; amorphous Fe was also observed in some Fe/hcp metal multilayers when the Fe layer thickness was less than 1.7-2.5 nm [9][10][11]; an amorphous →fcc → bcc phase change of Fe layer with increasing Fe/Ti bilayers was found in the Fe/Ti multilayers prepared by dc-magnetron sputtering [12]. All these new phases have considerable effect on the magnetic properties of the films.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties and microstructure of vapour-deposited Fe/Hf films upon thermal annealing

Zhang¹,

Ma²,

Pan³

2000

J. Phys. D: Appl. Phys.

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Fe/Hf multilayers were prepared by alternate deposition of pure hafnium and iron. As-deposited samples were then annealed at 380 °C and 550 °C, respectively, to investigate the microstructure and magnetic property changes of the films. It was found that all as-deposited Fe/Hf films exhibited the soft ferromagnetic property where the coercive force was lower than 30 Oe. The coercive force and the magnetic moment per Fe atom changed significantly with the annealing temperature and the Fe layer thickness (tFe ). For tFe = 2.2-4.2 nm films, their soft ferromagnetic properties were stable upon thermal annealing at 380 and 550 °C, while for tFe 9.5 nm and tHf = 13.2 nm films, after annealing at 550 °C for 20 min, as-deposited films transformed from having a soft ferromagnetic property to having a hard ferromagnetic one. The residual magnetization and maximum magnetic energy product of the films could come up to about 0.81 µB and 8.8 kJ m-3 (1.1 MGOe), for the Fe(9.5 nm)/Hf(13.2 nm) films annealed at 550 °C. It was also found that there were two metastable phases with fcc structure in the annealed Fe-Hf films. The magnetic change mechanism was discussed in terms of interdiffusion in the Fe/Hf interface and phase transformation in the films upon thermal annealing.

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