scholarly journals Rapid Annealing Optimizing Magnetic Softness and Thermal Stability of Mn-Substituted Fe-Based Nanocrystalline Alloys

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 20
Author(s):  
Bojun Zhang ◽  
Fuyao Yang ◽  
Aina He ◽  
Huiyun Xiao ◽  
Yaqiang Dong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Stabilization ◽  
Nanocrystalline Alloys ◽  
Magnetic Domains ◽  
Nano Structure ◽  
Magnetic Microstructure ◽  
Mn Doping ◽  
Rapid Annealing ◽  
Magnetic Softness ◽  
Nano Grains

Good high-frequency magnetic softness and thermal stability are very important for the wide application of Fe-based nanocrystalline alloys. The present work reports the influence of Mn-doping and rapid annealing on the magnetic softness, nano-structure, and magnetic-microstructure of Fe76−xSi13B8Nb2Cu1Mnx (x = 0, 1, 2, 3, and 4) alloys. It was found that the Fe74Si13B8Nb2Cu1Mn2 alloy exhibits a superior magnetic softness with the high-saturation magnetic induction of 1.32 T and a large permeability at 100 kHz of over 15,000 at a large annealing-temperature region of 120 °C. The microstructure and magnetic domains characterization indicate that the good magnetic softness and thermal stabilization can be ascribed to the superb nano-structural stability caused by the Mn doping and rapid annealing at elongated temperatures, which can maintain a fine and high number density α-Fe(Si) nano-grains and facilitate the formation of regular and wide domains.

Thermal Stabilization of Non-Stoichiometric GaAs through Beryllium Doping

1998 ◽  
Vol 510 ◽  
Author(s):  
R.C. Lutz ◽  
P. Specht ◽  
R. Zhao ◽  
S. Jeong ◽  
J. Bokor ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Carrier Lifetime ◽  
Thermal Stabilization ◽  
High Resistivity ◽  
X Ray Diffraction ◽  
Defect Band ◽  
Temperature Growth ◽  
Undoped Material ◽  
Strain Compensation ◽  
Beryllium Doping

AbstractBeryllium-doped, non-stoichiometric GaAs grown by MBE at low temperatures appears superior to its undoped counterpart in several key areas vital to device manufacturing. X-ray diffraction studies have indicated that material grown above 275°C shows complete thermal stability to annealing at temperatures up to 600°C. This behavior is ascribed in part to strain compensation between the small beryllium atoms and the large arsenic antisites. Consequently, outdiffusion of excess arsenic from the non-stoichiometric material into neighboring layers upon annealing or subsequent high temperature growth is expected to be negligible. Short carrier lifetime (<1 psec) and high resistivity (>104 Ω-cm) have been observed in the same as-grown material. Sub-picosecond lifetimes have been measured previously in undoped material, but the low growth temperatures required produce a supersaturation of antisites allowing for significant hopping conductivity through the defect band in as-grown material, and significant arsenic outdiffusion upon annealing. Due to electrical compensation of antisites by beryllium acceptors, materials in which the ionized antisites represent a major fraction of a relatively small total antisite concentration are now made possible by proceeding to higher growth temperatures. Thus, nonstoichiometric GaAs having a beneficial combination of thermal stability, short carrier lifetime and high resistivity can be fabricated

scholarly journals Modeling of canonical and C2′-O-thiophenylmethyl modified hexamers of RNA. Insights into the nature of structural changes and thermal stability

2018 ◽  
Vol 42 (12) ◽  
pp. 10177-10183
Author(s):  
Yannick Kokouvi Dzowo ◽  
Carly Wolfbrandt ◽  
Marino J. E. Resendiz ◽  
Haobin Wang
Keyword(s):  
Thermal Stability ◽  
Structural Changes ◽  
Thermal Stabilization

Modification of the C2′-O-position with thiophenylmethyl groups on both strands leads to thermal stabilization of the duplex. Predicting the effects that modifications will have on structure of RNA is of importance in the development of new RNA technologies.

scholarly journals Resonant nanodiffraction x-ray imaging reveals role of magnetic domains in complex oxide spin caloritronics

2020 ◽  
Vol 6 (40) ◽  
pp. eaba9351
Author(s):  
Paul G. Evans ◽  
Samuel D. Marks ◽  
Stephan Geprägs ◽  
Maxim Dietlein ◽  
Yves Joly ◽  
...  
Keyword(s):  
Magnetic Domain ◽  
Complex Oxide ◽  
Resonant Scattering ◽  
Magnetic Domains ◽  
Substantial Impact ◽  
Magnetic Microstructure ◽  
X Ray ◽  
Energy Domain ◽  
Buried Layers ◽  
Spin Electronic

Spin electronic devices based on crystalline oxide layers with nanoscale thicknesses involve complex structural and magnetic phenomena, including magnetic domains and the coupling of the magnetism to elastic and plastic crystallographic distortion. The magnetism of buried nanoscale layers has a substantial impact on spincaloritronic devices incorporating garnets and other oxides exhibiting the spin Seebeck effect (SSE). Synchrotron hard x-ray nanobeam diffraction techniques combine structural, elemental, and magnetic sensitivity and allow the magnetic domain configuration and structural distortion to be probed in buried layers simultaneously. Resonant scattering at the Gd L2 edge of Gd3Fe5O12 layers yields magnetic contrast with both linear and circular incident x-ray polarization. Domain patterns facet to form low-energy domain wall orientations but also are coupled to elastic features linked to epitaxial growth. Nanobeam magnetic diffraction images reveal diverse magnetic microstructure within emerging SSE materials and a strong coupling of the magnetism to crystallographic distortion.

The role of glycosylation and domain interactions in the thermal stability of human angiotensin-converting enzyme

2008 ◽  
Vol 389 (9) ◽  
Author(s):  
Hester G. O'Neill ◽  
Pierre Redelinghuys ◽  
Sylva L.U. Schwager ◽  
Edward D. Sturrock
Keyword(s):  
Thermal Stability ◽  
Angiotensin Converting Enzyme ◽  
Physicochemical Properties ◽  
Mammalian Cells ◽  
Insect Cells ◽  
Thermal Stabilization ◽  
Site Directed Mutagenesis ◽  
Converting Enzyme ◽  
Complex Glycans ◽  
Thermal Stability Of

Abstract The N and C domains of somatic angiotensin-converting enzyme (sACE) differ in terms of their substrate specificity, inhibitor profiling, chloride dependency and thermal stability. The C domain is thermally less stable than sACE or the N domain. Since both domains are heavily glycosylated, the effect of glycosylation on their thermal stability was investigated by assessing their catalytic and physicochemical properties. Testis ACE (tACE) expressed in mammalian cells, mammalian cells in the presence of a glucosidase inhibitor and insect cells yielded proteins with altered catalytic and physicochemical properties, indicating that the more complex glycans confer greater thermal stabilization. Furthermore, a decrease in tACE and N-domain N-glycans using site-directed mutagenesis decreased their thermal stability, suggesting that certain N-glycans have an important effect on the protein's thermodynamic properties. Evaluation of the thermal stability of sACE domain swopover and domain duplication mutants, together with sACE expressed in insect cells, showed that the C domain contained in sACE is less dependent on glycosylation for thermal stabilization than a single C domain, indicating that stabilizing interactions between the two domains contribute to the thermal stability of sACE and are decreased in a C-domain-duplicating mutant.

Magnetic microstructure of NANOPERM-type nanocrystalline alloys

2006 ◽  
Vol 243 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Marcel Miglierini ◽  
Tomáš Kaňuch ◽  
Peter Švec ◽  
Tibor Krenický ◽  
Milan Vůjtek ◽  
...  
Keyword(s):  
Nanocrystalline Alloys ◽  
Magnetic Microstructure

scholarly journals Heat Treatment Effect on Magnetic Microstructure of Fe73.9Cu1Nb3Si13.2B8.9 Thin Films

2018 ◽  
Vol 185 ◽  
pp. 04001
Author(s):  
Evgeniya Mikhalitsyna ◽  
Ivan Zakharchuk ◽  
Ekaterina Soboleva ◽  
Pavel Geydt ◽  
Vasiliy Kataev ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Amorphous State ◽  
Magnetic Domain ◽  
Domain Size ◽  
Magnetic Domains ◽  
Magnetic Microstructure ◽  
Glass Substrates ◽  
Radio Frequency Sputtering ◽  
Anisotropy Model

Fe73.9Cu1Nb3Si13.2B8.9 (Finemet) thin films were deposited on the glass substrates by means of radio frequency sputtering. The films thickness was varied from 10 to 200 nm. Heat treatment at temperatures of 350, 400 and 450 °C were performed for 30 minutes in order to control thin film structural state. The X-ray powder diffractometry revealed that the crystallization of α-FeSi nanograins took place only at 450 °C whilst the other samples stayed in the amorphous state. Relation between the structure and magnetic properties of the films was discussed in the framework of random magnetic anisotropy model and the concept of stochastic magnetic domains. The latter was investigated using magnetic force microscopy (MFM). MFM data showed formation of such magnetic domains only in samples thermally treated at 450 °C. There was a tendency of the magnetic domain size reduction with the thickness decrease.

High Bs Fe84−xSi4B8P4Cux (x = 0 – 1.5) nanocrystalline alloys with excellent magnetic softness

2011 ◽  
Vol 109 (7) ◽  
pp. 07A303 ◽  
Author(s):  
Fanli Kong ◽  
Anding Wang ◽  
Xingdu Fan ◽  
He Men ◽  
Baolong Shen ◽  
...  
Keyword(s):  
Nanocrystalline Alloys ◽  
Magnetic Softness
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