Hysteresis, magnetostriction and domain structure of soft magnetic nanocrystalline Fe based compounds

1990 ◽  
Vol 26 (5) ◽  
pp. 1403-1405 ◽  
Author(s):  
R. Grossinger ◽  
R. Heszke ◽  
A. Hernando ◽  
O. Mayerhofer ◽  
K.H. Muller ◽  
...  
Keyword(s):  
Domain Structure ◽  
Soft Magnetic

Magnetic Microscopy of Fe/Mn/Fe Layers

1997 ◽  
Vol 475 ◽  
Author(s):  
H. Hopster ◽  
Y. Iwasaki ◽  
J. Barthel ◽  
E.B. Maiken ◽  
B.P. Miller ◽  
...  
Keyword(s):  
Domain Structure ◽  
Secondary Electron ◽  
Critical Thickness ◽  
Magnetic Domain ◽  
Magnetic Films ◽  
Polarization Analysis ◽  
Domain Pattern ◽  
Soft Magnetic ◽  
Ferromagnetic Order ◽  
Delayed Onset

Abstract Manganese layers were deposited on polycrystalline Fe-based soft magnetic films. The magnetic domain structure of thin Fe overlayers on top these Mn films was measured by secondary electron microscopy with polarization analysis. The Fe layers show spin polarization only beyond a certain critical thickness of about 20 Å. Beyond this thickness the domain structure of the substrate starts to appear in the Fe overlayer. This delayed onset of ferromagnetic order in the Fe layers is attributed to frustration of ferromagnetic order due to the strong coupling to the antiferromagnetically ordered Mn. With increasing Fe film thickness (between 20–30 Å) the magnetization increases and shows the same domain pattern as the substrate. We find that for all Mn thicknesses studied (up to 170 Å) the Fe overlayer domain structure reproduces the substrate domain structure and the magnetization is always aligned parallel with the substrate magnetization.

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.

Effects of Order-Disorder Reactions on the Magnetic Properties of Rapidly Quenched Fe-6.5% Si Alloy

2014 ◽  
Vol 802 ◽  
pp. 530-534
Author(s):  
F.A. Nascimento ◽  
M.C.A. da Silva
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Domain Structure ◽  
Power Loss ◽  
Magnetic Measurement ◽  
Annealing Treatment ◽  
Antiphase Domain ◽  
Spray Forming ◽  
Soft Magnetic ◽  
Treatment Conditions

Deposits of the Fe-6.5wt%Si alloy rapidly quenched by spray forming were investigated. The order phase can be either B2 or DO3 depending on annealing treatment conditions. The observation of pairs dislocations indicates the presence of super dislocations and B2 antiphase boundaries (APBs) which affects significantly the soft magnetic properties. The dislocations bound the APBS which yield δ fringes when image 200 superlattice reflections. Samples treated at 700oC for 1 h were oil quenched, this has induced a decreasing of power loss and the TEM micrographs have showed developed 1⁄4 <111> antiphase domain structure in the B2 phase. The magnetic properties were: power loss of 1.59 W/kg and coercive force of 76 A/m, at B=1 T, f=60 Hz. The samples annealed at 1250°C for 1h showed the same interaction between the APBs but better power losses on their magnetic properties. The magnetic properties were: 1.30 W/kg power loss and 40 A/m coercive force, at same conditions described above. This suggests a strong interaction between magnetic properties and antiphase domain structure in the B2 ordered phase. Optical microscopy observations corroborate the magnetic measurement conclusions.

Influence of the domain structure on the microwave permeability of soft magnetic films and multilayers

2005 ◽  
Vol 292 ◽  
pp. 201-209 ◽  
Author(s):  
Frédéric Schoenstein ◽  
Patrice Aublanc ◽  
Hubert Pagès ◽  
Samuel Queste ◽  
Valérie Barentin ◽  
...  
Keyword(s):  
Domain Structure ◽  
Magnetic Films ◽  
Soft Magnetic ◽  
Microwave Permeability ◽  
Magnetic Films And Multilayers ◽  
Soft Magnetic Films

Influence of mechanical and thermal actions on domain structure and magnetostriction of iron-based soft magnetic alloys

2012 ◽  
Vol 113 (9) ◽  
pp. 843-848
Author(s):  
V. V. Gubernatorov ◽  
Yu. N. Dragoshanskiy ◽  
T. S. Sycheva ◽  
S. A. Ol’kov
Keyword(s):  
Domain Structure ◽  
Soft Magnetic ◽  
Magnetic Alloys ◽  
Soft Magnetic Alloys ◽  
Iron Based

scholarly journals Application Potential of Nanocrystalline Ribbons Still Pending

2010 ◽  
Vol 61 (5) ◽  
pp. 264-270
Author(s):  
Pavol Butvin ◽  
Beata Butvinová ◽  
Peter Švec ◽  
Jozef Sitek
Keyword(s):  
Magnetic Anisotropy ◽  
Domain Structure ◽  
Power Loss ◽  
Hysteresis Loops ◽  
Wide Spread ◽  
Soft Magnetic ◽  
Principal Reason ◽  
Macroscopic Stress ◽  
Application Potential

Application Potential of Nanocrystalline Ribbons Still Pending Nanocrystalline soft-magnetic ribbons promised a wide-spread practical use when introduced at the beginning of nineties. After 20 years of extensive research there are still unclear material problems which are thought to be the principal reason why these materials show but marginal use. Poorly controllable magnetic anisotropy due to spontaneous intrinsic macroscopic stress that comes from an inevitable heterogeneity of the ribbon materials is pointed to in this work. Certain stress-based mechanisms are shown to induce the unintended anisotropy in the already familiar Finemets as well as in the newer Hitperms. Hysteresis loops, domain structure and power loss is used to reveal the anisotropy consequences and particular connected but still unanswered questions are pinpointed.

Domain Structure and Properties of Soft Magnetic Iron- Based Alloys with Different Magnetic Treatment

2010 ◽  
Vol 168-169 ◽  
pp. 219-222
Author(s):  
Yu.N. Dragoshanskii ◽  
V.V. Shulika ◽  
A.P. Potapov ◽  
V.F. Tiunov
Keyword(s):  
Magnetic Field ◽  
Domain Structure ◽  
Magnetic Loss ◽  
Structure And Properties ◽  
Soft Magnetic ◽  
Soft Magnets ◽  
Frequency Magnetic Field ◽  
Electromagnetic Characteristics ◽  
Iron Based ◽  
The Impact

The paper deals with the domain structure and electromagnetic characteristics of soft magnetic iron-based alloys, which are formed by the impact of thermomagnetic treatment (TMT) - cooling of the material in the presence of a magnetic field. The effect of reducing the specific magnetic loss in materials, using a constant or alternating (different frequency) magnetic field is determined. It is shown that the minimum magnetic losses in the materials are obtained after TMT in an alternating magnetic field at high (~ 80 kHz) frequencies. This shows up the perspectives of TMT of soft magnets.

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