Evolution of magnetism in Hf–Fe metallic glasses

Pajić, Damir; Marohnić, Ž.; Drobac, Đuro; Zadro, Krešo; Ristić, Ramir; Babić, Emil

doi:10.1016/j.jallcom.2011.12.085

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…It is possible that in our sample, some MNPs are non-or weakly interacting (Peak 1), and others have a strong interaction, showing a super-spin-glass behaviour (Peak 2). This possibility is also supported by a similar behaviour observed in the literature [39][40][41] and could be better investigated in the future by studying the third harmonic signal of the sample [40,42]. All the results obtained by the fit proposed in Figure 5 are valid in non-zero DC fields.…”

Section: Resultssupporting

confidence: 85%

The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

et al. 2023

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The AC magnetic properties of a sample of Fe3O4 nanoparticles coated with oleic acid have been investigated with the help of AC susceptibility measurements. In particular, several DC magnetic fields have been superimposed on the AC field, and their effect on the magnetic response of the sample has been analysed. The results show the presence of a double peak structure in the imaginary component of the complex AC susceptibility measured as a function of the temperature. A preliminary evaluation of the Mydosh parameter for both peaks gives the information that each one of them is associated with a different state of interaction between nanoparticles. The two peaks evolve both in amplitude and position when the intensity of the DC field is changed. The field dependence of the peak position shows two different trends, and it is possible to study them in the framework of the currently existing theoretical models. In particular, a model of non-interacting magnetic nanoparticles has been used to describe the behaviour of the peak at lower temperatures, whereas the behaviour of the peak at higher temperatures has been analysed in the framework of a spin-glass-like model. The proposed analysis technique can be useful for the characterisation of magnetic nanoparticles used in several types of applications, such as biomedical and magnetic fluids.

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Section: Resultssupporting

confidence: 85%

The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

et al. 2023

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“…The magnetic susceptibility of the Cantor alloy in Figure 15 has a similar value to that of the Hf 1-x Fe x MGs [ 113 ] with x around 0.4, which correspond to a superparamagnetic state. Although the M–H curve for the alloy with x = 0.3 is qualitatively similar to that of the Cantor alloy ( Figure 15 ), it shows a somewhat more complex magnetic behavior at low temperatures.…”

Section: Resultsmentioning

confidence: 92%

Transition from High-Entropy to Conventional Alloys: Which Are Better?

et al. 2021

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The study of the transition from high-entropy alloys (HEAs) to conventional alloys (CAs) composed of the same alloying components is apparently important, both for understanding the formation of HEAs and for proper evaluation of their potential with respect to that of the corresponding CAs. However, this transition has thus far been studied in only two types of alloy systems: crystalline alloys of iron group metals (such as the Cantor alloy and its derivatives) and both amorphous (a-) and crystalline alloys, TE-TL, of early (TE = Ti, Zr, Nb, Hf) and late (TL = Co, Ni, Cu) transition metals. Here, we briefly overview the main results for the transition from HEAs to CAs in these alloy systems and then present new results for the electronic structure (ES), studied with photoemission spectroscopy and specific heat, atomic structure, thermal, magnetic and mechanical properties of a-TE-TL and Cantor-type alloys. A change in the properties of the alloys studied on crossing from the HEA to the CA concentration range mirrors that in the ES. The compositions of the alloys having the best properties depend on the alloy system and the property selected. This emphasizes the importance of knowing the ES for the design of new compositional complex alloys with the desired properties.

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“…In the Fe–Hf system, alloying is found to reduce the magnetic moment of Fe, and for Hf concentration above 50 at%, the system becomes nonmagnetic. [ 49 ] In the absence of proximity‐induced magnetization in Hf layers, the maximum thickness of the magnetic dead layer can be D md = d = 0.45 nm, which correspond to m i = 0. However, the total thickness of the magnetic dead layer at both the interfaces together, as obtained from MOKE measurements, is 0.8 nm.…”

Section: Figurementioning

confidence: 99%

Study of Interfaces in Hf/Fe System Using Magneto‐Optical Kerr Effect and Soft X‐Ray Absorption Spectroscopy

Vishwakarma

Gupta

Reddy

et al. 2020

Physica Rapid Research Ltrs

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Interface between layers of Fe and Hf is studied using magneto‐optical Kerr effect (MOKE) and soft X‐ray absorption spectroscopy (SXAS). Measurements as a function of the Fe layer thickness are done in a single sample by making use of a wedge‐shaped geometry for Fe layer sandwiched between two layers of Hf. SXAS measurements at the L‐edge of Fe provide evidence for interfacial alloying between Fe and Hf layers, with the thicknesses of the intermixed layers at Fe‐on‐Hf and Hf‐on‐Fe interfaces being 0.18 ± 0.05 and 0.27 ± 0.05 nm, respectively. Evolution of the MOKE hysteresis loop with Fe layer thickness gives an effective magnetic dead layer of 0.8 ± 0.1 nm at the two Fe/Hf interfaces together. Precise determination of the thickness of the intermixed layer and the magnetic dead layer using two independent techniques allows us to have a better insight into the interfacial magnetism and origin of magnetic dead layer at Fe/Hf interfaces. Present results suggest that the origin of the effective magnetic dead layer is partly due to modified magnetic moments of Fe and Hf in the intermixed regions and partly due to proximity‐induced magnetic moment in the interfacial Hf layers with its magnetic moment aligned antiparallel to the Fe layer.

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Evolution of magnetism in Hf–Fe metallic glasses

Cited by 5 publications

References 24 publications

The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

Transition from High-Entropy to Conventional Alloys: Which Are Better?

Study of Interfaces in Hf/Fe System Using Magneto‐Optical Kerr Effect and Soft X‐Ray Absorption Spectroscopy

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