Magnetic properties of amorphous alloys of Fe with La, Lu, Y, and Zr

Heiman, Neil; Kazama, Noriaki

doi:10.1103/physrevb.19.1623

Cited by 88 publications

(22 citation statements)

References 24 publications

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“…Fe/Lu 2 O 3 interface The crystalline LuFe 2 alloy displays T C =610 K and B hf ∼18-19 T at RT [15], while the corresponding amorphous alloy has T C <100 K [16]. The lower peak in the distribution reported in Figure 1 is at ∼20 T. From CEMS results, the majority of the Fe atoms are located at sites characterized by higher fields (25-30 T), and this contribution possibly accounts for a hydrogenated LuFe 2 compound, having a higher B hf than LuFe 2 [10].…”

Section: Resultsmentioning

confidence: 99%

CEMS characterisation of Fe/high-κ oxide interfaces

Mantovan¹,

Wiemer²,

Zenkevich

et al. 2006

Hyperfine Interact

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The interfaces between Fe and different high-κ oxides are investigated by means of conversion electron Mössbauer spectroscopy (CEMS). Information on the magnetic ordering at the interface is obtained from the magnetic hyperfine splitting of the Mössbauer spectra. The reactivity of the Fe atoms at the interface (intermixing) is also estimated by CEMS. X-ray diffraction (XRD) and X-ray reflectivity (XRR) provide additional information on the intermixing and different phases present at the interface. CEM-spectra show the presence of both ferromagnetic and paramagnetic phases. CEMS and XRD results show that the Fe/HfO 2 and Fe/Al 2 O 3 interfaces are the least reactive. The degree of intermixing between Fe and the high-κ oxide is determined by the oxide surface roughness.

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Section: Resultsmentioning

confidence: 99%

CEMS characterisation of Fe/high-κ oxide interfaces

Mantovan¹,

Wiemer²,

Zenkevich

et al. 2006

Hyperfine Interact

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“…These alloys exist in either the amorphous or the crystalline phases. It has also been suggested [16] that an effective spin quantum value of (g À 1) J can be used for the RE ions, where g is the Landé factor and J ¼ L þ S denotes the sum of the orbital and magnetic components of spin. The model presented in this paper, to the author's knowledge, has not been published before, even in the mean-field approximation.…”

Section: Numerical Applications To Fe C Gd 1-c and Discussionmentioning

confidence: 99%

Calculations of Bulk-Like Transition Temperatures of Rare Earth-Transition Metal Alloys AcB1-c Using the Effective Field Theory

Tamine¹

2002

phys. stat. sol. (b)

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The mean bulk-like transition temperatures are calculated as a function of the concentration c in the simple cubic Ising ferrimagnetic alloys A c B 1--c which have an antiferromagnetic coupling between the A and B species. The application of the calculations to the alloy Fe c Gd 1--c is presented. An effective field theory that goes beyond the mean-field approximation is used, yielding spin values and effective exchange interaction energies. A calculation is presented for the phase diagram, giving the Curie and the compensation temperatures as a function of the alloy concentration c for given magnetic exchange constants. Such a diagram is described as a function of the J Gd-Fe , J Gd-Gd , and J Fe-Fe exchange integral values. A fixed set of exchange interactions in the entire concentration range 0 c 1 is defined. The numerical calculations show that there is an overall qualitative agreement between theory and experiment in this range.

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“…Bulk metallic glasses (BMGs) have been developed in the last decades because of their unique mechanical, chemical and magnetic properties [1][2][3]. These glassy alloys are generally brittle depending on their composition because they have low atomic mobility.…”

Section: Introductionmentioning

confidence: 99%

“…The crystalline parts can be formed from the amorphous structure (produced by annealing) or from the crystalline phases remaining from the initial material (in the case of ballmilling). Glassy alloys can be produced by quenching [1,3] and by solid state techniques such as mechanical milling or alloying [2,3]. Amorphous alloys can be produced by rapid cooling to the glass temperature in order to avoid the gem forming.…”

Section: Introductionmentioning

confidence: 99%

Investigation of AgAlCuZr amorphous/crystalline structure produced by casting and milling

Tomolya

Janovszky

Sycheva

et al. 2014

Journal of Alloys and Compounds

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Advanced Ag 8 Al 8 Cu 36 Zr 48 master alloys were produced by arc-and induction melting and examined. The arc-melted ingot has an amorphous structure with a certain amount of metastable phase, compared to the induction-melted ingot, which contained AlCu 2 Zr, CuZr 2 and Ag 3 Al phases. Amorphous wedge-shape samples were produced by centrifugal casting from the arc-melted master alloy. Amorphous/crystalline powders were synthesized by ball-milling with different milling times from the induction-melted master alloy. The resulting powder contained Ag 2 Al phase after 5h milling, the amount of which was reduced after 9h milling. The thermal stability of the samples was investigated by DSC. The effective activation energies of the first crystallization were evaluated according to Kissinger's method and there were found to be the same, 271-268 J/g. The low activation energy suggests a good ductility. IntroductionBulk metallic glasses (BMGs) have been developed in the last decades because of their unique mechanical, chemical and magnetic properties [1][2][3]. These glassy alloys are generally brittle depending on their composition because they have low atomic mobility. In order to reach a wide application of these BMG's, it is necessary to increase the ductility by generating multiple shear bands and preventing sudden destructive processes [4]. The brittleness of the amorphous structure disappears and the sample becomes ductile owing to the alloying elements with positive heat of mixing and the ductility of the formed crystalline parts. Ag and Al combined with Cu and Zr can be a good association to obtain a ductile and tough BMG. The ductility can be enhanced by nanosized crystalline parts formed by partial crystallization of BMG's, which can prevent the development of cracks and improve the ductility of the material [4]. The crystalline parts can be formed from the amorphous structure (produced by annealing) or from the crystalline phases remaining from the initial material (in the case of ballmilling). Glassy alloys can be produced by quenching [1,3] and by solid state techniques such as mechanical milling or alloying [2,3]. Amorphous alloys can be produced by rapid cooling to the glass temperature in order to avoid the gem forming. Depending on the cooling rate, amorphous alloys with various properties can be produced. The other common method to produce amorphous alloys is the milling, especially the ball-milling. During milling, the effect of the transmitted energy causes the formation of the amorphous structure in the powders. Accordingly, in this work Ag 8 Al 8 Cu 36 Zr 48 master alloys were produced by induction and arc-melting, the amorphous/crystalline structure was subsequently produced by casting and ball-milling. A small amount with high quality and purity of master alloy can be produced by the arc-melting. A high quality master alloy is required to produce amorphous alloy by casting. A larger, but not homogenous ingot can be produced by induction melting. This initial alloy can be used to produce...

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Magnetic properties of amorphous alloys of Fe with La, Lu, Y, and Zr

Cited by 88 publications

References 24 publications

CEMS characterisation of Fe/high-κ oxide interfaces

CEMS characterisation of Fe/high-κ oxide interfaces

Calculations of Bulk-Like Transition Temperatures of Rare Earth-Transition Metal Alloys AcB1-c Using the Effective Field Theory

Investigation of AgAlCuZr amorphous/crystalline structure produced by casting and milling

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