Magnetic properties of Fe100−Sm  thin films and Fe80−Sm B20 thin films and ribbons

Seqqat, M.; Noguès, M.; Crisan, O.; Kuncser, V.; Cristea, Luciana; Jianu, A.; Filoti, G.; Dormann, J.L.; Sayah, D.; Godinho, M.

doi:10.1016/0304-8853(95)01111-0

Cited by 22 publications

(9 citation statements)

References 9 publications

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“…Our patterns show large overlapped Bragg peaks, especially at low temperatures. In intermetallic alloys such large patterns are characteristic of materials with small nano-crystals [9][10][11] with structural disorder [12,13] or predominant amorphous-like structure [14]. Therefore, in order to correctly deconvolute and assign the observed peaks, a refinement fitting procedure had to be performed.…”

Section: Structural Phase Transformationmentioning

confidence: 99%

Phase transformation and exchange bias effects in mechanically alloyed Fe/magnetite powders

Crisan

2011

Journal of Alloys and Compounds

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Section: Structural Phase Transformationmentioning

confidence: 99%

Phase transformation and exchange bias effects in mechanically alloyed Fe/magnetite powders

Crisan

2011

Journal of Alloys and Compounds

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“…It can be seen that in the case of NP dispersed in CMC the behavior is of a soft magnetic material, which is typical for mono-phased materials based on Fe [24][25][26][27][28]. Magnetization rises sharply at very low applied fields and reaches saturation at around 500-1000 Oe applied field.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

Hybrid Nanoelectronic-magnetic Device with Magnetoresistive Effect for logic integrated platforms in Spintronics

Crisan¹,

Crisan²,

Luculescu³

2019

Preprint

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We propose a concept of hybrid nanoelectronic-magnetic device for logic integrated platforms made of magnetic core-shell nanoparticles deposited onto prepatterned Si (111) substrate with basic logic circuitry made of metallic conductive lines. The synthesis of magnetic material and the creation of nanoelectronic prepatterned interdigitated die is reported and its capabilities are demonstrated in terms of magnetotransport properties. The laser pyrolysis method is employed in order to synthesize magnetic core-shell Fe / FeC nanoparticles with sizes between 12 – 15 nm. E-beam lithography has been used in order to design and execute two different layouts of interdigitated die, prepatterned with logic capacity, one with two pads and 50 microns thick conductive metallic lines, another one with 4 pads and parallel 5 microns thick conductive lines separated by 5 microns thick spacer. The as-obtained structures are morphologically characterized by means of optical, scanning and transmission electron microscopies. As-synthesized core-shell nanoparticles have been magnetically characterized inasmuch as the hybrid device obtained by depositing centrifugated and dispersed core-shell nanoparticles from liquid carrier solutions. For the first time, a significant giant magnetoresistive (GMR) effect has been observed and measured for the hybrid architectured device made of Fe / FeC nanosized materials on pre-patterned interdigitated die. A ∆R/R of 8% at 4.2 K has been measured from conductivity-in-plane electron transport measurements. This opens possibilities for the use of such devices as arrays of nanosensors and in spintronic applications.

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“…In the case of systems exhibiting an L1 0 phase, the high ordering temperature hinders their potential as future nanocomposite RE-free exchange-coupled magnets. It is thought that the reduction of this value can be achieved by adding other elements to the composition, such as Au, Ag, Nb or Zr, with the aim of promoting earlier ordering by segregation to the FePt grain boundaries [20][21][22][23][24] or a glass-forming element (B) to allow the formation of a chemically disordered phase as a precursor for both hard and soft magnetic phases, exchange-coupled to optimize in this way the magnetic properties [25][26][27][28][29][30][31][32][33][34][35]. We have previously shown [2] that the Fe-Pt-Ag-B melt-spun alloy shows a direct formation of the L1 0 phase from the as-cast state without subsequent annealing.…”

Section: Introductionmentioning

confidence: 99%

Role of Disordered Precursor in L10 Phase Formation in FePt-Based Nanocomposite Magnet

2021

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In order to prove the usefulness of having a structurally disordered precursor to the formation of FePt L10 phase and to facilitate the co-existence of exchange coupled hard and soft magnetic phases with optimized magnetic properties in various conditions of annealing, a Fe-Pt-Zr-B melt spun alloy has been synthesized and detailed structural and magnetic investigations have been undertaken to probe its phase evolution during annealing. The dynamics of formation of the hard magnetic L10 phase during the gradual disorder–order phase transformation has been monitored by using a complex combination of X-ray diffraction methods and 57Fe Mössbauer spectroscopy methods, over a wide range of annealing temperatures. Multiple phases co-existing in the annealed sample microstructures, observed in XRD, have been reconfirmed by the Mössbauer spectra analysis and, moreover, accurate quantitative data have been acquired in what concerns the relative abundance of each of the observed crystalline phases in every stage of annealing. It is shown that the formation of the hard magnetic phase, emerging from the chemically disordered precursor, is gradual and occurs via complex mechanisms, involving the presence of a disordered Fe-Zr-B-rich intergranular region which contributes to an increase in the abundance of the L10 phase for higher annealing temperatures. Magnetic measurements have confirmed the good performances of these alloys in terms of coercivity and remanence. These results contribute to the development of these alloys as the next generation of rare earth, free permanent magnets.

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Magnetic properties of Fe100−Sm thin films and Fe80−Sm B20 thin films and ribbons

Cited by 22 publications

References 9 publications

Phase transformation and exchange bias effects in mechanically alloyed Fe/magnetite powders

Phase transformation and exchange bias effects in mechanically alloyed Fe/magnetite powders

Hybrid Nanoelectronic-magnetic Device with Magnetoresistive Effect for logic integrated platforms in Spintronics

Role of Disordered Precursor in L10 Phase Formation in FePt-Based Nanocomposite Magnet

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