Magnetic properties of amorphous Fe93Zr7 films: Effect of light ion implantation

Zamani, Atieh; Moubah, R.; Ahlberg, Martina; Stopfel, Henry; Arnalds, Unnar B.; Hallén, Anders; Hjörvarsson, Bjørgvin; Andersson, Gabriella; Jönsson, Petra E.

doi:10.1063/1.4917212

Cited by 12 publications

(3 citation statements)

References 45 publications

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“…A sample was deposited from a compound target and the details about the sample preparation are given in Ref. 32 . and samples were deposited via co-sputtering from individual Fe and Zr targets at room temperature on 3 Si (001) substrates.…”

Section: Methodsmentioning

confidence: 99%

Unveiling the local structure of the amorphous metal $$\text {Fe}_{(1-x)}\text {Zr}_x$$ combining first-principles-based simulations and modelling of EXAFS spectra

Muscas

Johansson

George

et al. 2023

Sci Rep

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Amorphous alloys exhibit useful properties such as the excellent soft magnetic behaviour of Fe-based metallic glasses. The detailed structure of amorphous $$\text {Fe}_{(1-x)}\text {Zr}_x$$ Fe ( 1 - x ) Zr x with x = 0.07, 0.10, and 0.20 is in this work explored through a synergetic combination of atomistic simulations and experimental characterisation. Thin-film samples were investigated using X-ray diffraction and extended X-ray absorption fine structure (EXAFS), while the corresponding atomic structures were simulated using an efficient first-principles-based method called stochastic quenching (SQ). The simulated local atomic arrangements are investigated by constructing the radial- and angular-distribution functions, as well as by Voronoi tesselation. The radial distribution functions are then used to construct a model to fit simultaneously the experimental EXAFS data of multiple samples with different compositions, creating a simple yet accurate description of the atomic structures valid for any composition in the range x = 0.07 to 0.20, using a minimal number of free parameters. This approach significantly improves the accuracy of the fitted parameters and allows us to relate the compositional dependence of the amorphous structures with the magnetic properties. The proposed EXAFS fitting process can be generalised to other amorphous systems, contributing to the understanding of structure-property relationships and the development of amorphous alloys with tailored functional properties.

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Section: Methodsmentioning

confidence: 99%

Unveiling the local structure of the amorphous metal $$\text {Fe}_{(1-x)}\text {Zr}_x$$ combining first-principles-based simulations and modelling of EXAFS spectra

Muscas

Johansson

George

et al. 2023

Sci Rep

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“…Fe-Zr-B 𝑇 𝐶 series metallic glasses, however, are more promising candidates for the application of room temperature magnetic refrigeration due to their being relatively nearer to the 𝑇 𝐶 room temperature. The effect of elements doping on the magnetic properties of Febased amorphous alloys has been studied in literature [20,21] and they show that adjusting the compositions is a feasible method to obtain materials with desired properties. In this work, different new minor additions into FeZrB systems were attempted and the effect was investigated in order to further understand the relationship between MCE and its composition.…”

Section: Introductionmentioning

confidence: 99%

The effect of different minor additions on the magneto-caloric effect of FeZrB metallic ribbons near room temperature

Guo

Yuan

Chan

2018

Journal of Magnetism and Magnetic Materials

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“…Zamani et al [38,39] and Moubah et al [40,41] studied the effect of light ion implantation (H, He, B, C, and N) on the Curie temperature of amorphous Fe 93 Zr 7 films, together with extended x-ray absorption fine structure (EXAFS) measurements. They observed that the increase of T C is proportional to the increase in the average Fe-Fe distance, which allowed them to conclude that the dominant cause of the T C enhancement of amorphous Fe 93 Zr 7 upon doping is a volume effect.…”

Section: Introductionmentioning

confidence: 99%

Influence of the critical Fe atomic volume on the magnetism of Fe-rich metallic glasses evidenced by pressure-dependent measurements

et al. 2016

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Despite the intensive studies for decades, it is still not well understood how qualitatively different magnetic behaviors can occur in a narrow composition range for the Fe-rich Fe-transition metal (TM) amorphous alloys. In this study of amorphous Fe 100−x Zr x (x = 7, 9, 12) metallic glasses, normal ferromagnetism (FM) is found at 12 % Zr where only the FM-paramagnetic (PM) transition is observed at the Curie temperature, T C . In contrast, spin-glass (SG)-PM transition at a temperature, T g , called SG temperature, is only observed at 7 % Zr, while in the transient re-entrant composition range (x = 8−11), an SG-FM transition at a temperature, T f , called spin-freezing temperature, is also observed at low temperature besides the normal FM-PM transition at T C . In order to understand this unusual behavior, a detailed characterization of pressure (atomic volume), composition, and temperature dependence of the magnetic properties is coupled with high pressure synchrotron x-ray diffraction determination of the pressure dependence of the atomic volume. The results on Fe 100−x Zr x (x = 7, 9, 12) are compared to those obtained for the FM Co 91 Zr 9 metallic glass not showing any kind of anomalous magnetic properties. It is confirmed that the unusual behavior is caused by a granularlike magnetic structure where weakly coupled magnetic clusters are embedded into a FM bulk matrix. Since the mechanism of the magnetization reversal was found to be of the curling type rather than homogeneous rotation, the energy barrier determining the blocking temperature of the clusters is calculated as AR, where A is the exchange constant and R is the cluster size, in contrast to the usual characterization of the energy barrier by KV where K is the anisotropy energy and V is the cluster volume. The volume fraction of the FM part is a fast changing function of the bulk composition: Almost 100% FM fraction is found at 12 % of Zr while no trace of real FM is observed at 7 at % Zr. The driving force of this surprising magnetic character is the atomic volume: The lower the Zr content, the higher is the fraction of Fe atoms with compressed atomic volume having low magnetic moment. The percolation of their network separates the clusters from the FM bulk. The complex magnetic behavior of the Fe-rich Fe-Zr amorphous system at low temperatures can thus be interpreted with the only assumption of a cluster-size distribution and a weak coupling of the clusters to the FM matrix. The introduction of this coupling is able to explain the opposite pressure dependence of T g and T f . The threshold atomic volume in the low magnetic moment regions is found to be comparable to the atomic volume characteristic to the low-spin limit of the face-centered-cubic Fe alloys. The extensive literature results on the anomalous magnetism for various Fe-rich Fe-TM amorphous alloys and especially for the Fe-rich Fe-Zr glassy system are also found to be in agreement with this granular magnetic behavior.

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Magnetic properties of amorphous Fe93Zr7 films: Effect of light ion implantation

Cited by 12 publications

References 45 publications

Unveiling the local structure of the amorphous metal $$\text {Fe}_{(1-x)}\text {Zr}_x$$ combining first-principles-based simulations and modelling of EXAFS spectra

Unveiling the local structure of the amorphous metal $$\text {Fe}_{(1-x)}\text {Zr}_x$$ combining first-principles-based simulations and modelling of EXAFS spectra

The effect of different minor additions on the magneto-caloric effect of FeZrB metallic ribbons near room temperature

Influence of the critical Fe atomic volume on the magnetism of Fe-rich metallic glasses evidenced by pressure-dependent measurements

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