Magnetic properties of iron-rich Fe-Zr glasses

Ryan, D. H.; Coey, J. M. D.; Batalla, E.; Altounian, Z.; Ström‐Olsen, J. O.

doi:10.1103/physrevb.35.8630

Cited by 250 publications

(103 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, T co is not a true Curie temperature. Furthermore, it is important to note that the observed T co is in good agreement with those Curie temperatures reported [14][15][16][17][18] for Fe-rich FeZr amorphous alloys with Fe content close to the FeCu content of the sample presently investigated. It is likely that these reported values also might correspond to compensation temperatures.…”

supporting

confidence: 67%

“…We propose that this anti-Invar effect is due to volume expansion enhanced by the increase of the thermal expansion coefficient at T co . Probably the controversial features of Fe rich FeZr amorphous alloys [13][14][15][16][17] could be explained by a similar continuous transition, induced by either temperature or applied field changes, between noncollinear to collinear spin configurations. …”

mentioning

confidence: 99%

See 1 more Smart Citation

Field and temperature dependence of magnetization in FeCu-based amorphous alloys

et al. 2000

View full text Add to dashboard Cite

In this paper, the production of FeCu-based FeCuZr amorphous alloys by ball milling is reported. The thermal dependence of magnetization for the ͑Fe 0.5 Cu 0.5 ͒ 85 Zr 15 (at. %) amorphous alloy has been found to show a dramatic field dependence of the kink point of the magnetization. This kink corresponds to a temperature different from the Curie temperature, above 400 K, of the ferromagnetic phase, which, according to spin waves fitting, can be induced by applying external fields. Just above 235 K, the thermoremanence increases sharply, and this feature strongly suggests an increase of the ferromagnetic ordering under zero field heating. Neutron diffraction experiments seem to confirm the enhancement of spin alignment. The thermal expansion above the compensation temperature is proposed to be the origin of the thermoremanence enhancement through the anti-Invar effect as might be explained within the framework of recent ab initio calculations ͓M. van Schilfgaarde et al., Nature ͑London͒ 400, 46 ͑1999͔͒.The FeCu system is a typical one with a high and positive enthalpy of mixing. 1 However, extended regions of metastable solubility can be obtained via several nonequilibrium processing techniques, such as vapor-quenching, 2 sputtering, 3 and mechanical alloying. 4,5 The crystalline structure of the Fe x Cu 1Ϫx solid solutions depends on the Fe content, being fcc for xϽ60 at. %, bcc for xϾ70 at. %, whereas a mixture of fcc and bcc phases is observed for the intermediate composition range. The fcc alloys have attracted a special interest because they exhibit ferromagnetic behavior for a wide range of compositions ͑above 20 at. % in Fe͒, although fcc-Cu or fcc-Fe at their ground state, are not ferromagnetic. 3,[6][7][8] In particular, EXAFS experiments carried out in fcc-Fe 0.5 Cu 0.5 ͑Ref. 9͒ have shown that the lattice is expanded with respect to the fcc Cu lattice, therefore is likely that Invar effects 10 are related to the ferromagnetic behavior of fcc-FeCu alloys.To induce amorphicity in the FeCu system we have added 15 at. % of Zr. Notice that FeZr amorphous alloy exhibit typical Invar properties as high volume magnetostriction 11 and a remarkable Curie temperature dependence on the hydrostatic pressure. 12 Amorphous powders of nominal composition ͑Fe 0.5 Cu 0.5 ͒ 85 Zr 15 (at. %) were obtained by high energy ball milling in a planetary mill with hardened stainless-steel vials and 10 mm diameter stainless-steel balls in a ball-to-powder weight ratio of 15:1. In order to avoid the oxidation of the powder during the milling, the vials were sealed under argon atmosphere prior to the milling. The composition of the final powder was checked by energy dispersive x-ray analysis ͑EDX͒. No traces of others elements, such as Cr or Ni, coming from the milling vial or balls were detected in the analysis of the EDX results. X-ray-diffraction pattern shows the typical broad halo characteristic of amorphous systems; see Fig. 1͑a͒. The XRD pattern of a nanocrystalline of a fcc-͑Fe 0.5 Cu 0.5 ͒ 93 Zr 7 (at. %) solid solution,...

show abstract

supporting

confidence: 67%

mentioning

confidence: 99%

Field and temperature dependence of magnetization in FeCu-based amorphous alloys

et al. 2000

View full text Add to dashboard Cite

show abstract

“…For completely amorphous iron zirconium alloys in this concentration range, the Curie temperature would be approximately 200 K, [14][15][16] as mentioned above. These samples, however, show a ferromagnetic signal even at room temperature, proving the existence of a crystalline fraction.…”

Section: B Structural Characterizationmentioning

confidence: 99%

Morphology of amorphousFe91Zr9∕Al2O3multilayers: Dewetting and crystallization

et al. 2007

View full text Add to dashboard Cite

Amorphous Fe 91 Zr 9 /Al 2 O 3 multilayers grown by magnetron sputtering have been studied using x-ray reflectometry, x-ray diffraction, Rutherford backscattering spectrometry, and transmission electron microscopy. It could be demonstrated that on the interface between the Fe 91 Zr 9 and the Al 2 O 3 , crystalline grains are formed, that for very small repetition thicknesses destroy the periodicity of the multilayers by accumulative roughness. Understanding these effects would enable substantial improvement of the quality of nanolaminated amorphous layers.

show abstract

“…The values of the coercive and saturation fields of the as-grown sample are higher than those of the implanted samples. The decrease of the coercive and saturation fields upon implantation are associated with the diminishing of the non-collinear ferromagnetism of the asgrown FeZr films 13 due to less exchange frustration that drastically reduces the size of the energy barriers hindering domain wall motion, induced by the increase of the Fe-Fe interatomic distance.…”

mentioning

confidence: 99%

Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

Moubah

Ahlberg

Zamani

et al. 2014

Journal of Applied Physics

View full text Add to dashboard Cite

We report on the origin of the anomalous temperature dependence of coercivity observed in some soft ferromagnets by studying the magnetic and electronic properties of FeZr films doped using ion implantation by H, He, B, C, and N. The anomalous increase of the coercivity with temperature was observed only in the C- and B-doped samples. Using x-ray photoelectron spectroscopy, we show that the anomalous behavior of the coercivity coincides with the occurrence of an electron charge transfer for those implanted samples. The origin of the anomaly is discussed in terms of (i) magnetic softness, (ii) nature of the Fe-C and -B covalent bonds, and (iii) large charge transfer

show abstract

Magnetic properties of iron-rich Fe-Zr glasses

Cited by 250 publications

References 36 publications

Field and temperature dependence of magnetization in FeCu-based amorphous alloys

Field and temperature dependence of magnetization in FeCu-based amorphous alloys

Morphology of amorphousFe91Zr9∕Al2O3multilayers: Dewetting and crystallization

Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

Contact Info

Product

Resources

About