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.

Components of Magnetic Anisotropy of Soft Magnetic Nanocrystalline Fe-Based Films

2015 ◽  
Vol 233-234 ◽  
pp. 619-622 ◽  
Author(s):  
E.V. Harin ◽  
Elena N. Sheftel
Keyword(s):  
Magnetron Sputtering ◽  
Magnetic Anisotropy ◽  
Hysteresis Loops ◽  
Anisotropy Field ◽  
The Other ◽  
Structure Parameters ◽  
Soft Magnetic ◽  
Local Anisotropy ◽  
Magnetoelastic Anisotropy ◽  
Residual Macrostresses

We present quantitative evaluation results of micromagnetic structure parameters of nanocrystalline Fe, Fe95Zr5, Fe90N10, and Fe85Zr5N10films obtained by magnetron sputtering. It is shown that quantities of magnetocrystallineK1, magnetoelasticKME, magnetostaticKMS, and surfaceKa,Sanisotropies are components of experimentally measured effective local anisotropyKeff. The shape of the hysteresis loops of the films is determined by the presence of two main macroscopic effective magnetic anisotropies, one of which is the anisotropy field of stochastic domains, and the other is the magnetoelastic anisotropy field due to residual macrostresses.

scholarly journals Optimization of magnetic properties and GMI effect of Thin Co-rich Microwires for GMI Microsensors

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1558 ◽  
Author(s):  
Lorena Gonzalez-Legarreta ◽  
Paula Corte-Leon ◽  
Valentina Zhukova ◽  
Mihail Ipatov ◽  
Juan Maria Blanco ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Hysteresis Loops ◽  
Transverse Magnetic ◽  
Wide Frequency Range ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Annealing Temperatures ◽  
High Annealing

Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect improvement was achieved either by annealing or stress-annealing. Annealed Co-rich presents rectangular hysteresis loops. However, an improvement in magnetoimpedance ratio is observed at fairly high annealing temperatures over a wide frequency range. Application of stress during annealing at moderate values of annealing temperatures and stress allows for a remarkable decrease in coercivity and increase in squareness ratio and further giant magnetoimpedance effect improvement. Stress-annealing, carried out at sufficiently high temperatures and/or stress allowed induction of transverse magnetic anisotropy, as well as magnetoimpedance effect improvement. Enhanced magnetoimpedance ratio values for annealed and stress-annealed samples and frequency dependence of the magnetoimpedance are discussed in terms of the radial distribution of the magnetic anisotropy. Accordingly, we demonstrated that the giant magnetoimpedance effect of Co-rich microwires can be tailored by controlling the magnetic anisotropy of Co-rich microwires, using appropriate thermal treatment.

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.

Magnetization Reversal and Domain Structure оf Magnetic Tunnel Junctions

2010 ◽  
Vol 168-169 ◽  
pp. 253-256
Author(s):  
A.S. Samardak ◽  
E.V. Sukovatitsina ◽  
A.V. Ognev ◽  
M. Anisimova ◽  
Erik Wahlström ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Magnetic Anisotropy ◽  
Domain Structure ◽  
Magnetization Reversal ◽  
Tunnel Junctions ◽  
Magnetic Layer ◽  
Soft Magnetic ◽  
Barrier Layers ◽  
Structure Surface ◽  
New Applications

This paper is devoted to the investigation of crystalline structure, surface morphology, magnetic anisotropy, coercive force and domain structure of spin-valves with a single and double MgO barrier layers. It is shown that domain structure and magnetization reversal are the same for both systems, but otherwise the behavior of tunnel magnetoresistance is different. The approach to control magnetic anisotropy in soft magnetic layer using temperature annealing is demonstrated. It makes these structures possible for new applications in nanoelectronics.

MAGNETIC PROPERTIES AND DOMAIN STRUCTURE OF CoFeB/Pd MULTILAYERS WITH PERPENDICULAR MAGNETIC ANISOTROPY

2019 ◽  
Vol 57 (6) ◽  
pp. 685
Author(s):  
Duy-Truong Quach
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Domain Structure ◽  
Kerr Effect ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Perpendicular Magnetic Anisotropy ◽  
Domain Structures ◽  
Vibration Sample Magnetometer ◽  
Magneto Optical Kerr Effect

The magnetic properties and domain structure of (CoFeB/Pd)n (n = 2 – 10) multilayers with perpendicular magnetic anisotropy have been investigated systematically. The study has been carried out by using vibration sample magnetometer (VSM) and magneto-optical Kerr effect (MOKE) microscope. The results show clear changes of magnetic hysteresis and domain structure when increasing the number of bilayer (n) from 2 to 10. With increasing the number of bilayer, the multilayers’ hysteresis loops change from square-shaped to slanted, while domain structures change from circular-like to maze.

Influence of Magnetoelastic Anisotropy on Properties of Nanostructured Microwires

2013 ◽  
Vol 646 ◽  
pp. 59-66 ◽  
Author(s):  
Arcady Zhukov ◽  
Margarita Churyukanova ◽  
Lorena Gonzalez-Legarreta ◽  
Ahmed Talaat ◽  
Valentina Zhukova ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Hysteresis Loops ◽  
Magnetic Behaviour ◽  
Soft Magnetic ◽  
Magnetoelastic Anisotropy ◽  
Thermal Expansion Coefficients ◽  
Magnetoelastic Energy ◽  
Expansion Coefficients ◽  
The Difference ◽  
Magneto Resistance

We studied the effect ofthe magnetoelastic ansitropy on properties of nanostructured glass-coated microwires with soft magnetic behaviour (Finemet-type microwires of Fe70.8Cu1Nb3.1Si14.5B10.6, Fe71.8Cu1Nb3.1Si15B9.1 and Fe73.8Cu1Nb3.1Si13B9.1 compositions) and with granular structure (Cu based Co-Cu microwires). The magnetoelastic energy originated from the difference in thermal expansion coefficients of the glass and metallic alloy during the microwires fabrication, affected the hysteresis loops, coercivity and heat capacity of Finemet-type microwires. Hysteresis loops of all as-prepared microwires showed rectangular shape, typical for Fe-rich microwires. As expected, coercivity, HC, of as-prepared microwires increases with decreasing of the ratio ρ defined as the ratio between the metallic nucleus diameter, d to total microwire diameter, D. On the other hand we observed change of heat capacity in microwires with different ratio ρ. In the case of Co-Cu microwires ρ- ratio affected the structure and the giant magneto-resistance of obtained microwires.

Atomic structure of soft magnetic Fe-Si alloys with induced magnetic anisotropy

2006 ◽  
Vol 101 (S1) ◽  
pp. S59-S62 ◽  
Author(s):  
N. V. Ershov ◽  
Yu. P. Chernenkov ◽  
V. A. Lukshina ◽  
V. I. Fedorov ◽  
B. K. Sokolov
Keyword(s):  
Magnetic Anisotropy ◽  
Atomic Structure ◽  
Soft Magnetic ◽  
Induced Magnetic Anisotropy

Exchange Bias in CrO2/Cr2O3 Bilayer Thin Films

2006 ◽  
Vol 45 ◽  
pp. 2528-2533 ◽  
Author(s):  
S. Srinath ◽  
N.A. Frey ◽  
H. Srikanth ◽  
G.X. Miao ◽  
A. Gupta
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Variable Thickness ◽  
Exchange Bias ◽  
Exchange Coupling ◽  
Hysteresis Loops ◽  
Anisotropy Constant ◽  
Effective Magnetic Anisotropy ◽  
Large Anisotropy

We have investigated the exchange bias in CVD grown epitaxial CrO2/Cr2O3 bilayer thin films using hysteresis loops and resonant RF transverse susceptibility. M-H loops indicated an enhanced coercivity without appreciable loop shift and the transverse susceptibility in CrO2/Cr2O3 bilayers revealed features associated with both the ferromagnetic and antiferromagnetic phases. In addition, TS yielded large anisotropy constant (Keff) values depending on the fraction of Cr2O3 present. The large anisotropy fields observed cannot be accounted for by the variable thickness of CrO2 alone and are indicative of possible exchange coupling between CrO2 and Cr2O3 phases that significantly affects the effective magnetic anisotropy.

Interfacial control of domain structure and magnetic anisotropy in La0.67Sr0.33MnO3 manganite heterostructures

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Da Lan ◽  
Pingfan Chen ◽  
Chao Liu ◽  
Xiaohan Wu ◽  
Ping Yang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Domain Structure
Sign in / Sign up

Export Citation Format

Share Document