Comparison of magnetoelastic properties between the 〈110〉 oriented TbxDy1-xFe1.95 polycrystalline alloys with different Tb/Dy composition ratio under magnetomechanical loading

2014 ◽  
Vol 28 (27) ◽  
pp. 1450187
Author(s):  
Pei Zhao ◽  
You-He Zhou ◽  
Zhong-Zheng Lin
Keyword(s):  
Magnetic Field ◽  
Coercive Force ◽  
Compressive Stress ◽  
Applied Magnetic Field ◽  
Room Temperature ◽  
Hysteresis Loops ◽  
Polycrystalline Alloys ◽  
Magnetoelastic Properties ◽  
Engineering Designs ◽  
Magnetostriction Hysteresis

This paper presents comparison of magnetoelastic properties between the 〈110〉 oriented Tb x Dy 1-x Fe 1.95 polycrystalline alloys for x = 0.27, 0.3, 0.45 under coupled loading of magnetic field and compressive stress. The simultaneously measure are investigated for the magnetization and magnetostriction under applied magnetic field from -200 to 200 kA/m and compressive stress from 0 to 50 MPa along the rod axis at room temperature. The results show that, according to the increase of Tb concentration and compressive stress, the hysteresis, coercive force and magnetostriction hysteresis loops of Tb x Dy 1-x Fe 1.95 alloys increase rapidly and the distortion of the hysteresis loops occurs at higher compressive stress, especially Tb 0.45 Dy 0.55 Fe 1.95 alloys, while the maximum relative permeability of Tb x Dy 1-x Fe 1.95 alloys monotonously decrease. Meanwhile, the higher the Tb concentration the stronger is magnetostrictive "jump" effect. For these experimental results, the effect of compressive stress and Tb / Dy ratio on magnetoelastic properties of Tb x Dy 1-x Fe 1.95 alloys are coupling and remarkable. A tradeoff and optimization are very important for many engineering designs and applications.

MAGNETOELASTIC PROPERTIES DEPENDENCE ON COMPRESSIVE STRESS IN 〈110〉 ORIENTED Tb0.45Dy0.55Fe1.95 POLYCRYSTALLINE ALLOYS WITH HIGH DRIVE LEVELS

2012 ◽  
Vol 26 (12) ◽  
pp. 1250074 ◽  
Author(s):  
PEI ZHAO ◽  
YOU-HE ZHOU
Keyword(s):  
Magnetic Field ◽  
Compressive Stress ◽  
Modern Technology ◽  
Field Range ◽  
Composition Ratio ◽  
Theoretical Approaches ◽  
Polycrystalline Alloys ◽  
Magnetoelastic Properties ◽  
Technology Applications ◽  
Magnetostriction Hysteresis

This paper presents the magnetoelastic properties for the relative high Tb / Dy composition ratio 〈110〉 oriented Tb 0.45 Dy 0.55 Fe 1.95 polycrystalline alloys. The simultaneous measurements of the magnetization and magnetostriction are carried out as a function of applied magnetic field range of 0 to 800 kA/m and compressive stress from 0 to 60 MPa. The maximum piezomagnetic coefficient $(d^{\rm max}_{33})$ and magnetostriction hysteresis (Wh) are obtained by differential calculation from the experimental curves. According to the increase of compressive stress, an obvious magnetostriction "jump" effect is observed, and the magnetostriction with the magnetic field of 800 kA/m (λ800) and magnetostriction hysteresis monotonously increase, while the maximum piezomagnetic coefficient increases first from 0 to 10 MPa and then decreases from 10 to 60 MPa. Here, results of measuring and calculating on this material are important complement to further understand the rules of the magnetoelastic properties in high Tb/Dy composition ratio Tb 0.45 Dy 0.55 Fe 1.95 polycrystalline alloys for theoretical approaches and modern technology applications.

Martensitic Transformation and Mechanical Properties of Fe-Doped Ni54Mn21Ga25 Alloys

2011 ◽  
Vol 687 ◽  
pp. 500-504
Author(s):  
S. X. Xue ◽  
S.S. Feng ◽  
P. Y. Cai ◽  
Q T Li ◽  
H. B. Wang
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Magnetic Properties ◽  
Martensitic Transformation ◽  
Curie Temperature ◽  
Directional Solidification ◽  
Transformation Temperature ◽  
Room Temperature ◽  
Martensitic Transformation Temperature ◽  
Polycrystalline Alloys

Ni54Mn21-xFexGa25（x=0,1,3,5,7,9）polycrystalline alloys were prepared by the technique of directional solidification and the effect of substituting Fe for Mn on the martensitic transformation and mechanical properties of the alloys was analyzed. It was found that the Curie temperature increased with increasing substitution while the martensitic transformation temperature decreased. The Fe-doped Ni54Mn21Ga25 alloys exhibit excellent magnetic properties at room temperature; the typical Ni54Mn20Fe1Ga25 alloy shows a large magnetic-induced-strain of -1040 ppm at a magnetic field of 4000 Oe.

scholarly journals Tемпературная зависимость магнитных свойств и магнитополевого поведения тонкопленочных трехслойных Co/Gd/Co систем

2021 ◽  
Vol 63 (10) ◽  
pp. 1542
Author(s):  
А.М. Харламова ◽  
А.В. Макаров ◽  
А.В. Свалов ◽  
Е.Е. Шалыгина
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Coercive Force ◽  
Magnetic Moment ◽  
Hysteresis Loops ◽  
Magnetic Characteristics ◽  
Temperature Changes ◽  
Ion Plasma ◽  
Temperature Dependences ◽  
Oriented Parallel

The results of studies of the temperature dependences of the magnetic properties and magnetic field behavior of thin-film three-layer Co/Gd/Co system, obtained by ion-plasma magnetron sputtering, are present. The thickness of the cobalt layers is 5.0 nm, and the thickness of the Gd layers, tGd, varies from 3.0 to 10.0 nm. The bulk magnetic characteristics of the samples are measured on a vibrating magnetometer at the external magnetic field oriented parallel to the plane of the samples. The influence of the temperature and Gd thickness on the shape of the hysteresis loops, the values of the magnetic moment m and coercive force are discovered. In particular, with the temperature changes from 100 to 300 K, the decrease of the coercive force is observed. At a temperature above 150 K, magnetic moment increases. With increasing thickness of gadolinium, the value of m decreases.

scholarly journals The modified magnetodielectric response in KNN-CZFMO based particulate multiferroic composite system

2020 ◽  
Vol 10 (05) ◽  
pp. 2050024 ◽  
Author(s):  
Kulwinder Kaur ◽  
Mandeep Singh ◽  
Jaspal Singh ◽  
Sanjeev Kumar
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Room Temperature ◽  
Research Work ◽  
Hysteresis Loops ◽  
Magnetic Ordering ◽  
X Ray Diffraction ◽  
Universal Power Law ◽  
Multiferroic Composite ◽  
Magnetic Dielectric

Lead-free multiferroic composites of 1[Formula: see text](K[Formula: see text]Na[Formula: see text]NbO[Formula: see text](Co[Formula: see text]Zn[Formula: see text](Fe[Formula: see text]Mn[Formula: see text]O4 (KNN-CZFMO), where [Formula: see text]= 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 and 1.0, have been investigated for their structural, morphological, electrical, magnetic, dielectric and magneto-dielectric properties. Presence of KNN and CZFMO crystal structure in each composite has been confirmed from X-ray diffraction analysis (XRD). Cuboidal-shaped grains of KNN and spherical-shaped grains of CZFMO have been observed by scanning electron microscopy (SEM). The room temperature ferroelectric behavior as confirmed by polarization versus electric field ([Formula: see text]–[Formula: see text] hysteresis loops has been found to be decreasing with increasing CZFMO concentration. Increasing magnetic ordering with the increase in CZFMO concentration in the prepared composites has been observed by magnetization versus magnetic field ([Formula: see text]–[Formula: see text] hysteresis loops. The electrical conductivity of composites has been studied using Jonscher’s universal power law. The room temperature dielectric constant ([Formula: see text] and dielectric loss (tan [Formula: see text] have been observed to decrease with the increase in the frequency of the applied external electric field. The dielectric relaxation behavior has been observed using curve fitting analysis via the Havriliak–Negami relaxation model. Maximum value of the magnetodielectric (MD) effect [Formula: see text]−11% at a frequency of 1 kHz with the applied magnetic field of 1 T has been achieved for 0.9 KNN−0.1 CZFMO ([Formula: see text]= 0.1) composite in the present research work.

Influence of Magnetic Field on Magnetic Properties of Electrodeposited Co-Ni-P Nanowires

2014 ◽  
Vol 24 (3S1) ◽  
pp. 90-94 ◽  
Author(s):  
Le Tuan Tu ◽  
Luu Van Thiem ◽  
Pham Duc Thang
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Hysteresis Loops ◽  
Vibrating Sample Magnetometry ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Structure And Morphology ◽  
The Magnetic Field

The magnetic properties in Co-Ni-P nanowires arrays with diameter of 200 nm were investigated. All the samples were prepared by electrodeposition method with pH of 5.5 and at room temperature. During the deposition, a magnetic field in range of 0 - 750 Oe was applied parallel to the wires axis. The crystalline structure and morphology of the samples were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), respectively. The hysteresis loops were measured at room temperature using vibrating sample magnetometry (VSM). The mixture of hcp phases of the Co-Ni-P based nanowires has been indicated by the XRD pattern. The obtained results show that with 750 Oe magnetic field applied during deposition we can obtain maximum coercivity value (2180 Oe). The \(M_{r}/M_{s}\) ratio was rapid increased when the magnetic field changed from 0 Oe to 750 Oe.

The magnetostriction coefficients of nickel

1971 ◽  
Vol 326 (1564) ◽  
pp. 87-96 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Temperature Dependence ◽  
Applied Magnetic Field ◽  
Strain Gauge ◽  
Room Temperature ◽  
Significant Contribution ◽  
Cubic Crystal ◽  
Anisotropy Coefficients

Measurements of the magnetostriction have been made, by means of the strain gauge technique, at room temperature, and at 79 and 5 K , and the results have been analysed in terms of the usual five-coefficient expression for a cubic crystal. The lack of parallelism between the applied magnetic field and the magnetization, due to the magnetic anisotropy, was allowed for by a method which enabled values of the anisotropy coefficients K 1 K 2 and K 3 to be deduced. The magnetostriction coefficients h 3 and h 5 are zero within the experimental uncertainties at all three temperatures and h 3 is certainly too small to produce any significant contribution to K 1 . The temperature dependence of h 1 and h 2 cannot be described by the theory of Callen & Callen (1963).

Large Magnetoresistance at Room Temperature in Organic Semiconductor Sandwich Devices

2005 ◽  
Vol 871 ◽  
Author(s):  
Govindarajan Veeraraghavan ◽  
Omer Mermer ◽  
Thomas Lee Francis ◽  
Yugang Sheng ◽  
Tho Duc Nguyen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Film Thickness ◽  
Organic Semiconductors ◽  
Applied Magnetic Field ◽  
Room Temperature ◽  
Electrode Materials ◽  
Bulk Material ◽  
Temperature Dependent ◽  
Semiconducting Polymer ◽  
Mr Effect

AbstractWe describe a recently discovered magnetoresistance (MR) effect in semiconducting polymer and small molecule sandwich devices. The MR effect reaches up to 10% in a magnetic field of 10mT at room temperature. This MR effect is therefore amongst the largest of any bulk material. We characterize this effect and discuss its dependence on voltage, film thickness, temperature, electrode materials and (unintentional) impurity concentration in three different organic semiconductors. We found that the MR effect is only weakly temperature dependent and does not depend on sign and direction of the applied magnetic field. To the best of our knowledge, the discovered MR effect is not adequately described by any of the mechanisms known to date.

Influence of the Length-to-Width Ratio on the ΔE Effect of Amorphous Magnetoelastic Ribbons for Actuation Applications

2019 ◽  
Vol 826 ◽  
pp. 3-10 ◽  
Author(s):  
Ariane Sagasti ◽  
Miguel Llano ◽  
Andoni Lasheras ◽  
Ana Catarina Lopes ◽  
Jorge Feuchtwanger ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Young’S Modulus ◽  
Applied Magnetic Field ◽  
Young's Modulus ◽  
Bias Field ◽  
Width Ratio ◽  
Magnetic Bias ◽  
Magnetoelastic Properties ◽  
Simple Detection ◽  
Actuation Devices

Amorphous magnetoelastic alloys show outstanding magnetic and magnetoelastic properties that make them excellent candidates for simple detection and actuation devices. The coupling between elastic and magnetic properties reflects in the dependence of the Young’s modulus with the applied magnetic field. We present a study of the change of the Young’s modulus with the applied magnetic field in ribbons of Fe-Ni-Co-Si-B composition. Strips of different lengths (L = 35, 30, 25, 20 mm) and widths (w = 5, 3.3, 2.5, 1.7 mm) have been measured and obtained results analyzed in terms of the different length-to-width ratios (4 < R < 21). From our observations, depth of the ΔE effect reduces and needed applied magnetic bias field for minimum Young’s modulus value increases as the strips shortens. In order to test the applicability of these materials in a situation of open/close simple designed gas valve, FEM simulations have been performed by using the experimentally measured Young’s modulus values, searching to estimate the maximum deflection of such a strip when working under applied constant pressure. Obtained useful deflection ranges from 1 mm to 10 mm, telling us about the feasibility of this amorphous magnetoelastic ribbons for simple gas valve applications.

scholarly journals Evolution and competition between chiral spin textures in nanostripes with D2d symmetry

2020 ◽  
Vol 6 (49) ◽  
pp. eabc0723
Author(s):  
Jagannath Jena ◽  
Börge Göbel ◽  
Vivek Kumar ◽  
Ingrid Mertig ◽  
Claudia Felser ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Applied Magnetic Field ◽  
Room Temperature ◽  
Memory Storage ◽  
Heusler Compound ◽  
Storage Devices ◽  
Transmission Electron ◽  
Lorentz Transmission Electron Microscopy

Chiral spin textures are of considerable interest for applications in spintronics. It has recently been shown that magnetic materials with D2d symmetry can sustain several distinct spin textures. Here, we show, using Lorentz transmission electron microscopy, that single and double chains of antiskyrmions can be generated at room temperature in nanostripes less than 0.5 μm in width formed from the D2d Heusler compound Mn1.4Pt0.9Pd0.1Sn. Typically, truncated helical spin textures are formed in low magnetic fields, whose edges are terminated by half antiskyrmions. These evolve into chains of antiskyrmions with increasing magnetic field. Single chains of these objects are located in the middle of the nanostripes even when the stripes are much wider than the antiskyrmions. Moreover, the chains can even include elliptical Bloch skyrmions depending on details of the applied magnetic field history. These findings make D2d materials special and highly interesting for applications such as magnetic racetrack memory storage devices.

MAGNETIC MEASUREMENTS OF HIGH QUALITY SINGLE CRYSTAL YBa2Cu3O7-δ

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3697-3702
Author(s):  
A. TIRBIYINE ◽  
A. TAOUFIK ◽  
S. SENOUSSI
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Single Crystals ◽  
Applied Magnetic Field ◽  
Magnetic Measurements ◽  
Hysteresis Loops ◽  
High Quality ◽  
Flux Lines ◽  
Magnetization Hysteresis ◽  
Irreversible Magnetization

We have investigated the magnetic measurements on high quality single crystals of YBa 2 Cu 3 O 7-δ. Several magnetization hysteresis loops have been obtained for different temperature values, and as a function of the angle θ between the direction of the applied magnetic field and the c-axis of the sample. Measurements were performed at magnetic field up to 6 Tesla and various temperatures between 10 and 90 K. Magnetization hysteresis loops scale and shape are strongly dependent on the temperature values. Our results show that the magnetic properties are profoundly affected by flux lines pinning. The irreversible magnetization decreases as the applied magnetic field deviates from the c-axis (θ increases).

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