scholarly journals Soft Magnetic Properties of Ultra-Strong and Nanocrystalline Pearlitic Wires

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 23
Author(s):  
Stefan Wurster ◽  
Martin Stückler ◽  
Lukas Weissitsch ◽  
Heinz Krenn ◽  
Anton Hohenwarter ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Bulk Material ◽  
Annealing Treatment ◽  
Coarse Grained ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Magnetic Exchange ◽  
Two Phase ◽  
The One ◽  
The Individual

The paper describes the capability of magnetic softening of a coarse-grained bulk material by a severe deformation technique. Connecting the microstructure with magnetic properties, the coercive field decreases dramatically for grains smaller than the magnetic exchange length. This makes the investigation of soft magnetic properties of severely drawn pearlitic wires very interesting. With the help of the starting two-phase microstructure, it is possible to substantially refine the material, which allows the investigation of magnetic properties for nanocrystalline bulk material. Compared to the coarse-grained initial, pearlitic state, the coercivities of the highly deformed wires decrease while the saturation magnetization values increase—even beyond the value expectable from the individual constituents. The lowest coercivity in the drawn state is found to be 520 A m−1 for a wire of 24-µm thickness and an annealing treatment has a further positive effect on it. The decreasing coercivity is discussed in the framework of two opposing models: grain refinement on the one hand and dissolution of cementite on the other hand. Auxiliary measurements give a clear indication for the latter model, delivering a sufficient description of the observed evolution of magnetic properties.

Influence of annealing treatment on soft magnetic properties of Fe76Si10B10Cr2Y2 amorphous ribbon

2015 ◽  
Vol 627 ◽  
pp. 333-336 ◽  
Author(s):  
Shih Fan Chen ◽  
Chi Yu Hung ◽  
Shea Jue Wang ◽  
Shih Hsun Chen ◽  
Chien Chon Chen
Keyword(s):  
Magnetic Properties ◽  
Amorphous Ribbon ◽  
Annealing Treatment ◽  
Soft Magnetic Properties ◽  
Soft Magnetic

Effect of annealing treatment on soft magnetic properties of Fe–6.5wt% Si wide ribbons

2009 ◽  
Vol 321 (18) ◽  
pp. 2865-2870 ◽  
Author(s):  
R.K. Roy ◽  
A.K. Panda ◽  
M. Ghosh ◽  
A. Mitra ◽  
R.N. Ghosh
Keyword(s):  
Magnetic Properties ◽  
Annealing Treatment ◽  
Soft Magnetic Properties ◽  
Soft Magnetic

scholarly journals ANOMALOUS ELECTRODEPOSITION OF Fe-Ni ALLOY COATING FROM SIMPLE AND COMPLEX BATHS AND ITS MAGNETIC PROPERTY

2010 ◽  
Vol 10 (2) ◽  
pp. 108-122 ◽  
Author(s):  
M A Islam
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Current Density ◽  
Coarse Grained ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Alloy Electrodeposition ◽  
Ni Alloys ◽  
Ni Alloy

Electrodeposition of Fe-Ni thin films has been carried on copper substrate under various electrodeposition conditions from two simple and six complex baths. Sulfate baths composing of NiSO4. 7H2O, FeSO4.7H2O, H3BO3 and Na2SO4KEYWORDS: Anomalous Electrodeposition, Fe-Ni Coating, Complexing agent, Current Density, Magnetic Property. 1. INTRODUCTION Alloy electrodeposition technologies can extend tremendously the potential of electrochemical deposition processes to provide coatings that require unique mechanical, chemical and physical properties [1]. There has been a great research interest in the development and characterization of iron-nickel (Fe-Ni) thin films due to their operational capacity, economic interest, magnetic and other properties [2]. Due to their unique low coefficient of thermal expansion (CTE) and soft magnetic properties, Fe-Ni alloys have been used in industrial applications for over 100 years [3]. Typical examples of applications that are based on the low CTE of Fe-Ni alloys include: thermostatic bimetals, glass sealing, integrated circuit packaging, cathode ray tube, shadow masks, membranes for liquid natural gas tankers; applications based on the soft magnetic properties include: read-write heads for magnetic storage, magnetic actuators, magnetic shielding, high performance transformer cores. comprise the simple baths whereas complex baths were prepared by adding ascorbic acid, saccharin and citric acid in simple baths. The effect of bath composition, pH and applied current density on coating appearance, composition, morphology and magnetic property were studied. Wet chemical analysis technique was used to analyze the coating composition whereas SEM and VSM were used to study the deposit morphology and magnetic property respectively. Addition of complexing agents in plating baths suppressed the anomalous nature of Fe-Ni alloy electrodeposition. Coatings obtained from simple baths were characterized by coarse grained non-smooth surface with/without microcracks onto it whereas those from complex baths were fine grained with smooth surfaces. Satisfactory saturation magnetization value of 131.13 emu/g in coating was obtained from simple bath. Coatings obtained from complex baths did not show normal magnetization behavior.

ROLE OF MICROSTRUCTURE AND DOMAIN STRUCTURE ON THE SOFT MAGNETIC PROPERTIES OF MAGNETIC FIELD ANNEALED Fe89-xZr11Bx ALLOYS

2011 ◽  
Vol 10 (01n02) ◽  
pp. 301-305
Author(s):  
DEBABRATA MISHRA ◽  
A. PERUMAL ◽  
A. SRINIVASAN
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Domain Walls ◽  
Magnetic Coupling ◽  
High Resolution Electron Microscopy ◽  
Soft Magnetic Properties ◽  
Irregular Domain ◽  
Soft Magnetic ◽  
Two Phase ◽  
Magnetic Softness

We report the evolution of microstructure, domain structure, and soft magnetic properties of amorphous and nanocrystalline Fe 89-x Zr 11 B x(x = 0 - 10) alloys. High-resolution electron microscopy observations reveal that the annealed alloys exhibit a two-phase microstructure. Addition of B enhances the ferromagnetic properties of Fe – Zr amorphous phase in the two-phase structured microstructure, resulting in good soft magnetic properties. Large-sized domains with smooth domain walls are observed in the alloys annealed below 873 K, which exhibit excellent magnetic softness. On the other hand, in the alloys annealed above 873 K, small-sized domains with irregular domain walls and domain wall pinning by Fe – Zr compound are seen. The soft magnetic properties in Fe – Zr – B alloys not only depend on mean grain size, but also on the strength of the intergranular magnetic coupling and structural inhomogeneities.

Effect of Annealing Temperature on the Soft Magnetic Properties of Fe70.43Nb10.77Si15.77Cu2.34B0.69 Amorphous Aanostrips at 20K, 300K

2021 ◽  
Vol 1035 ◽  
pp. 773-777
Author(s):  
Sheng Lei ◽  
Shuai Li ◽  
Jun Sun ◽  
Ji Xiang Zhu ◽  
Ya Feng Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Practical Significance ◽  
Soft Magnetic Properties ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
Magnetic Induction Intensity ◽  
Saturation Magnetic Induction ◽  
Microstructure And Magnetic Properties

Since Fe-based amorphous alloys are widely used in magnetic separators, sensors and other fields, it is of practical significance to carry out research on amorphous strips used in this field.The effects of annealing temperature on the soft magnetic properties of Fe70.43Nb10.77Si15.77Cu2.34B0.69 amorphous nanostrips with 25 μm and 28 μm thickness prepared by the single roll cold method were investigated at 20 and 300K.Five specimens were annealed at472.12K, 672.12K, 772.12K, 822.12Kand 872.12K, respectively, and their microstructure and magnetic properties were tested viametallographic microscopy, X-ray diffraction, and vibrating specimen magnetometer. At cryogenic temperatureof 20K, specimens annealed at 672,12K exhibited the best magnetic properties, including the coercive forceof8.1265A/m, saturation magnetic induction intensity of1.4351T,and its residual value of 0.2462T. The comparative analysis of experimental results obtained strongly indicates that the soft magnetic properties of the amorphous alloy are significantly improved by the particular annealing treatment.

Study of Multicomponent Magnetic Nanostructures with Digital Image Processing Technique.

1988 ◽  
Vol 132 ◽  
Author(s):  
A. P. Valanju ◽  
I. S. Jeong ◽  
D. Y. Kim ◽  
R. M. Walser
Keyword(s):  
Thin Films ◽  
Image Processing ◽  
Magnetic Properties ◽  
Digital Image Processing ◽  
Digital Image ◽  
Fourier Transforms ◽  
Image Processing Technique ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Two Phase

ABSTRACTPreviously, we used Digital Image Processing (DIP) to explore the relationships between the growth morphologies of sputtered two-phase nanostructures and their soft magnetic properties [1]. In this work we extended the application of DIP to analyse the effects of deposition parameters and annealing conditions on their soft magnetic properties including disaccommodation.Magnetically soft, amorphous Co61B39 thin films, exhibiting a two-phase structure, were deposited by sequentially co-sputtering cobalt and boron. We digitized TEM micrographs of these thin films, prepared under different deposition conditions, and subjected to various post deposition processing. Digital Fourier transforms of the TEM micrographs were studied for evidence that the film anisotropy could be correlated with morphological order arising from long and short range interactions between particles over distances of ≈ 0.2 − 1.0 nm.Our qualitative studies showed that important changes in soft magnetic properties were associated with changes in the two phase morphologies. We determined, for example, that specific morphological changes were associated with the reduction in the magnetic anisotropy produced by annealing. In general, decreases in anisotropy were associated with increased isotropy in Fourier space. The largest reductions and circular symmetric 2D Fourier transforms were produced by rotating field annealing.

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