Dynamic Characteristics of Tb-Dy-Fe Polycrystals with Axial Alignment

2005 ◽  
Vol 475-479 ◽  
pp. 2251-2254 ◽  
Author(s):  
Bo Wen Wang ◽  
L. Weng ◽  
S.Y. Li ◽  
S.Z. Zhou ◽  
I. Gyuro
Keyword(s):  
Magnetic Fields ◽  
Dynamic Characteristics ◽  
Coupling Coefficient ◽  
Dynamic Strain ◽  
Magnetization Process ◽  
Standard Strain ◽  
Mechanical Coupling ◽  
Axial Alignment ◽  
Strain Coefficient ◽  
Lock In

The magnetostriction and dynamic characteristics of Tb0.27Dy0.73Fe2 polycrystals with <110> axial alignment were investigated by standard strain gauge, two coil induction and lock-in amplifier techniques. It is found that the magnetostriction of the sample quickly increases with increasing magnetic fields when H≤80 kA/m under a pressure of 5 or 10 MPa and a “jump” effect occurs during the magnetization process. The dynamic strain coefficient, d33, dynamic incremental permeability,μ33, and magneto-mechanical coupling coefficient, k33, for the Tb0.3Dy0.7Fe2 rod polycrystal sample with <110> axial alignment were measured and discussed. The Tb0.27Dy0.73Fe2 polycrystals with <110> axial alignment possesses excellent magnetostrictive properties along the <110> rod direction in low magnetic fields and it is very useful in application of industry.

Dynamic Magnetomechanical Properties of Terfenol-D/Epoxy 1-3 Particulate Composites

2002 ◽  
Author(s):  
Siu Wing Or ◽  
Geoffrey P. McKnight ◽  
Nersesse Nersessian ◽  
Gregory P. Carman
Keyword(s):  
Coupling Coefficient ◽  
Elastic Moduli ◽  
Volume Fraction ◽  
Bias Field ◽  
Particulate Composites ◽  
Dynamic Strain ◽  
Monolithic Material ◽  
Different Types ◽  
Strain Coefficient ◽  
Magnetomechanical Coupling

This paper describes the effect of particulate crystallographic orientation on the dynamic magnetomechanical properties of Terfenol-D/epoxy 1–3 magnetostrictive particulate composites. Two different types of composites with approximately 50% Terfenol-D volume fraction were fabricated for comparison with [112]-textured monolithic Terfenol-D. In the first type, needle-shaped, [112]-oriented particles cut from the monolithic Terfenol-D were used and in the second type, irregular-shaped, randomly oriented particles ball-milled from the monolithic material were employed. Elastic moduli (E33H and E33B), dynamic strain coefficient (d33), and magnetomechanical coupling coefficient (k33) were investigated as a function of bias field. Both composites demonstrate similar property trends with the negative-ΔE, d33, and k33 values maximizing near 30 kA/m. The maximum values achieved in the oriented type are up to 67% larger than the non-oriented type and approaches 65% of the monolithic Terfenol-D. The property improvement in the oriented type is shown to be attributed to [112] preferential particulate orientation.

Magnetization process and magnetic structure of the TmFe2H3.4 hydride in ultrahigh magnetic fields up to 100 T

1997 ◽  
Vol 167 (3) ◽  
pp. 229-236 ◽  
Author(s):  
N.V. Mushnikov ◽  
N.K. Zajkov ◽  
M.I. Bartashevich ◽  
T. Goto ◽  
H. Aruga-Katori ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Magnetic Structure ◽  
Magnetization Process ◽  
Ultrahigh Magnetic Fields

scholarly journals The Process of Magnetizing FeNbYHfB Bulk Amorphous Alloys in Strong Magnetic Fields

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1367
Author(s):  
Bartłomiej Jeż ◽  
Jerzy Wysłocki ◽  
Simon Walters ◽  
Przemysław Postawa ◽  
Marcin Nabiałek
Keyword(s):  
Magnetic Fields ◽  
Amorphous Alloys ◽  
Magnetization Vector ◽  
Direct Methods ◽  
Structural Defects ◽  
Alloy Sample ◽  
Magnetization Curves ◽  
Magnetization Process ◽  
Strong Magnetic Fields ◽  
Antiferromagnetic Ordering

The structure of amorphous alloys still has not been described satisfactorily due to the lack of direct methods for observing structural defects. The magnetizing process of amorphous alloys is closely related to its disordered structure. The sensitivity of the magnetization vector to any heterogeneity allows indirect assessment of the structure of amorphous ferromagnetic alloys. In strong magnetic fields, the magnetization process involves the rotation of a magnetization vector around point and line defects. Based on analysis of primary magnetization curves, it is possible to identify the type of these defects. This paper presents the results of research into the magnetization process of amorphous alloys that are based on iron, in the areas called the approach to ferromagnetic saturation and the Holstein–Primakoff para-process. The structure of a range of specially produced materials was examined using X-ray diffraction. Primary magnetization curves were measured over the range of 0 to 2 T. The process of magnetizing all of the tested alloys was associated with the presence of linear defects, satisfying the relationship Ddi p < 1H. It was found that the addition of yttrium, at the expense of hafnium, impedes the magnetization process. The alloy with an atomic content of Y = 10% was characterized by the highest saturation magnetization value and the lowest value of the Dspf parameter, which may indicate the occurrence of antiferromagnetic ordering in certain regions of this alloy sample.

scholarly journals Magnetization process of the breathing pyrochlore magnet CuInCr4S8 in ultrahigh magnetic fields up to 150 T

2020 ◽  
Vol 101 (5) ◽  
Author(s):  
Masaki Gen ◽  
Yoshihiko Okamoto ◽  
Masaki Mori ◽  
Koshi Takenaka ◽  
Yoshimitsu Kohama
Keyword(s):  
Magnetic Fields ◽  
Magnetization Process ◽  
Ultrahigh Magnetic Fields

Dynamic Studies on the Recurve Bow

2015 ◽  
Vol 741 ◽  
pp. 37-40
Author(s):  
Ji He Zhou ◽  
Yu Qin Shi
Keyword(s):  
Dynamic Characteristics ◽  
Strain Gauge ◽  
Dynamic Strain ◽  
Measurement Technology ◽  
Acceleration Sensor ◽  
Electrical Quantity ◽  
Dynamic Studies ◽  
Strain Process ◽  
Quantity Measurement

By utilizing the acceleration sensor and the strain gauge, the non electrical quantity measurement technology, we collected the data of the dynamic strain process in the actual shooting circumstances of athletes and get the data through the computer; exploratory proposed the dynamic characteristics of the bow.

Piezoelectric Properties in Textured Ceramics of SrBi2Nb2O9

2006 ◽  
Vol 320 ◽  
pp. 15-18 ◽  
Author(s):  
Takuya Sawada ◽  
Hirozumi Ogawa ◽  
Masahiko Kimura ◽  
Kosuke Shiratsuyu ◽  
Akira Ando
Keyword(s):  
Resonant Frequency ◽  
Grain Growth ◽  
Coupling Coefficient ◽  
Remanent Polarization ◽  
Vibration Mode ◽  
Piezoelectric Properties ◽  
Templated Grain Growth ◽  
Orientation Degree ◽  
Mechanical Coupling ◽  
Textured Ceramics

A study has been done for the piezoelectric properties in texured ceramics of SrBi2Nb2O9 (SBN) fabricated by the templated grain growth (TGG) method. Remanent polarization along to the stacking direction increased with the orientation degrees. That corresponds to the increases in electro-mechanical coupling coefficient with orientation degree. The temperature coefficient of the resonant frequency (TCF) in thickness sheer vibration mode changed from negative to positive with increasing orientation degrees, and an excellent TCF of -0.4 ppm/°C was obtained for the specimen with an orientation degree of 76%.

Stiffness and Damping Characteristics of a Wide Parabolic Film Slider Bearing Operating with Ferrofluids

2014 ◽  
Vol 1052 ◽  
pp. 132-136
Author(s):  
Jaw Ren Lin
Keyword(s):  
Magnetic Fields ◽  
Dynamic Characteristics ◽  
Dynamic Stiffness ◽  
Slider Bearing ◽  
Inclined Plane ◽  
Damping Characteristics ◽  
Plane Film ◽  
Stiffness And Damping

This paper investigates the dynamic characteristics of parabolic film slider bearing operating with ferrofluids. Comparing with the slider bearing of an inclined plane film, the parabolic film slider bearing operating with ferrofluids in the presence of external magnetic fields provide higher better dynamic stiffness and damping performances.

Current Induced Spin Injection in Si-MOSFET

2012 ◽  
Vol 190 ◽  
pp. 129-132
Author(s):  
I. Shlimak ◽  
A. Butenko ◽  
D.I. Golosov ◽  
K.J. Friedland ◽  
S.V. Kravchenko
Keyword(s):  
Magnetic Fields ◽  
Spin Injection ◽  
Dynamic Resistance ◽  
Experimental Scheme ◽  
Ac Current ◽  
Sample Resistance ◽  
Pass Through ◽  
Lock In ◽  
Dc Current ◽  
Parallel Magnetic Fields

Longitudinal resistivity in strong parallel magnetic fields up to B = 14 Tesla was measured in Si-MOSFET with a narrow slot (90nm) in the upper metallic gate that allows to apply different gate voltage across the slot and, therefore, to control the electron density n1 and n2 in two parts of the sample independently. The experimental scheme allows us to pass through the source-drain channel relatively large DC current (IDC), while the dynamic resistance was measured using a standard lock-in technique with small AC current. It was shown that the sample resistance is asymmetric with respect to the direction of DC current. The asymmetry increases with increase of magnetic field, DC current, and difference between n1 and n2. Results are interpreted in terms of a current-induced spin accumulation or depletion near the slot, as described by a spin drift-diffusion equation. The effect on the sample resistance is due to the positive magnetoresistance of Si-MOSFETs in parallel magnetic fields.

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