Observations of Interaction Between Magnetic Domain Wall and Grain Boundaries in Fe-3wt%Si Alloy by Kerr Microscopy

1999 ◽  
Vol 586 ◽  
Author(s):  
K. Kawahara ◽  
Y. Yagyu ◽  
S. Tsurekawa ◽  
T. Watanabe
Keyword(s):  
Domain Wall ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Domain Structure ◽  
Misorientation Angle ◽  
Magnetic Domain ◽  
Magnetic Domain Structure ◽  
Magnetic Domain Wall ◽  
Domain Structures ◽  
Grain Boundary Plane

ABSTRACTMagnetic domain structures in Fe-3wt%Si alloy have been observed by a Kerr microscopy to understand the interaction between the magnetic domain wall and grain boundaries. It was found that the domain structures in the vicinity of the grain boundary depend on the misorientation angle; the high angle random boundary disturbs the magnetic domain structure more than the low angle boundary. In addition to the misorientation angle, magnetic domain structures were affected by the inclination of the grain boundary plane. Moreover, dynamic observations of rearrangement of the magnetic domain structure during magnetization revealed that grain boundaries could act as the sink and/or the source for magnetic domains.

Magnetic Domain Structure of Nanocrystalline Zr18-xHfxCo82 Ribbons: Effect of Hf

2013 ◽  
Vol 1557 ◽  
Author(s):  
Lanping Yue ◽  
I. A. Al-Omari ◽  
Wenyong Zhang ◽  
Ralph Skomski ◽  
D. J. Sellmyer
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Structure Refinement ◽  
Magnetic Domain ◽  
Maximum Energy ◽  
Magnetic Domain Structure ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Domain Structures ◽  
Rapidly Solidified

ABSTRACTThe effect of Hf on the permanent magnetism of nanocrystalline Zr18-xHfxCo82 ribbons (x = 0, 2, 4, and 6) was investigated by magnetic properties measurement and magnetic force microscopy (MFM). Emphasis is on the local magnetic domain structures in polycrystalline rapidly solidified Zr18-xHfxCo82 ribbons for four different samples with small fractions of Hf dopants (x ≤ 6). The investigation of the magnetic properties of the Zr18-xHfxCo82 ribbons revealed that all the samples under investigation are ferromagnetic at room temperature, and the corresponding MFM images show bright and dark contrast patterns with up-down magnetic domain structures. It is found that the saturation magnetization and the coercivity depend on Hf doping concentration x in the samples. For a sample with Hf concentration x = 4, the maximum energy product (BH)max value is 3.7 MGOe. The short magnetic correlation length of 131 nm and smallest root-mean-square phase shift value of 0.680 were observed for x = 4, which suggests the refinement of the magnetic domain structure due to weak intergranular exchange coupling in this sample. The above results indicate that suitable Hf addition is helpful for the magnetic domain structure refinement, the coecivity enhancement, and the energy-product improvement of this class of rare-earth-free nanocrystalline permanent-magnet materials.

scholarly journals In-situ Observations of Interaction of Magnetic Domain Wall with Grain Boundaries by Lorentz Microscopy

Materia Japan ◽  
2004 ◽  
Vol 43 (12) ◽  
pp. 1001-1001
Author(s):  
Sadahiro Tsurekawa ◽  
Tadao Watanabe ◽  
Yohei Ando ◽  
Koichi Kawahara
Keyword(s):  
Domain Wall ◽  
Grain Boundaries ◽  
Magnetic Domain ◽  
Magnetic Domain Wall ◽  
Lorentz Microscopy

Effect of Boron Addition on Magnetic-Domain Structure of Rapidly Quenched Zr2Co11−Based Nanomaterials

MRS Advances ◽  
2016 ◽  
Vol 1 (34) ◽  
pp. 2379-2385 ◽  
Author(s):  
Lanping Yue ◽  
Yunlong Jin ◽  
David J. Sellmyer
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Structure Refinement ◽  
Magnetic Domain ◽  
Domain Size ◽  
Maximum Energy ◽  
Magnetic Domain Structure ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Domain Structures

ABSTRACTThe boron-content dependence of magnetic domain structures and magnetic properties of nanocrystalline Zr16Co82.5−xMo1.5Bx (x = 0, 1, 2, 3, 4) melt-spun ribbons have been investigated. Compared to x = 0, the smaller average domain size with a relatively short magnetic correlation length of 120 nm and largest root-mean-square phase shift value of 0.94° are observed for x = 1. The best magnetic properties of coercivity Hc = 5.4 kOe, maximum energy product (BH)max = 4.1 MGOe, and saturation polarization Js = 7.8 kG, were obtained for the ribbon with x = 1. The optimal B addition enhances the content of hard magnetic phase, promotes magnetic domain structure refinement, and increases the surface roughness, results in the enhancement of magnetic anisotropy, and thus leads to a significant increase in coercivity and energy product in this sample.

Pinning effect of the grain boundaries on magnetic domain wall in FeCo-based magnetic alloys

1999 ◽  
Vol 85 (9) ◽  
pp. 6655-6659 ◽  
Author(s):  
R. H. Yu ◽  
S. Basu ◽  
Y. Zhang ◽  
A. Parvizi-Majidi ◽  
John Q. Xiao
Keyword(s):  
Domain Wall ◽  
Grain Boundaries ◽  
Magnetic Domain ◽  
Magnetic Domain Wall ◽  
Magnetic Alloys ◽  
Pinning Effect

On the Formation of High Damping State in Fe-Al and Fe-Cr Alloys

2008 ◽  
Vol 137 ◽  
pp. 109-118 ◽  
Author(s):  
I.B. Chudakov ◽  
Nataly A. Polyakova ◽  
S.Yu. Mackushev ◽  
V.A. Udovenko
Keyword(s):  
Domain Structure ◽  
Domain Walls ◽  
Volume Fraction ◽  
Magnetic Domain ◽  
Al Alloys ◽  
The State ◽  
Magnetic Domain Structure ◽  
Damping Capacity ◽  
Domain Structures ◽  
Domain Boundaries

High damping Fe - Cr and Fe - Al alloys have been studied in two different states: in the high damping state and in the suppressed damping capacity state. It has been shown that magnetic domain structures of Fe - Cr and Fe - Al alloys are fundamentally different in the high damping state and in the state with the suppressed damping. Magnetic domain structure corresponding to the high damping state can be characterized by an enhanced volume fraction of the easy movable 90o-domain walls, but the state with the suppressed damping capacity can be characterized by the enhanced volume fraction of the 180o-domain boundaries.

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