scholarly journals Магнитоэлектрический эффект в парамагнитной области в Gd-=SUB=-0.15-=/SUB=-Mn-=SUB=-0.85-=/SUB=-Sе

2019 ◽  
Vol 61 (8) ◽  
pp. 1433
Author(s):  
С.С. Аплеснин ◽  
В.В. Кретинин ◽  
О.Б. Бегишева
Keyword(s):  
Magnetic Field ◽  
Solid Solution ◽  
Magnetoelectric Effect ◽  
Electric Polarization ◽  
Wagner Model ◽  
Residual Polarization ◽  
Temperature Range ◽  
Migration Polarization ◽  
The Magnetic Field

In the region of the percolation concentration in the GdxMn1-xSe solid solution, the electric polarization without a field and in 12 kOe magnetic field in the temperature range of 80–380 K was measured . For the composition with x = 0.15, the polarization hysteresis and the dependence of the residual polarization on the magnetic field and temperature were found. The hysteresis is explained in the model of migration polarization and the magnetoelectric effect in the Maxwell-Wagner model.

scholarly journals Структура, диэлектрические и магнитодиэлектрические свойства керамики мультиферроика 0.5BiFeO-=SUB=-3-=/SUB=--0.5PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=-

2020 ◽  
Vol 62 (10) ◽  
pp. 1677
Author(s):  
А.В. Павленко ◽  
К.М. Жидель ◽  
Л.А. Шилкина
Keyword(s):  
Magnetic Field ◽  
Solid Solution ◽  
Dielectric Loss ◽  
Constant Magnetic Field ◽  
Room Temperature ◽  
Magnetoelectric Effect ◽  
Dielectric Characteristics ◽  
Temperature Range ◽  
Cubic Structure

The structure, dielectric characteristics, and magnetoelectric effect of multiferroic 0.5BiFeO3–0.5PbFe0.5Nb0.5O3 ceramics were studied. Ceramics are found to be pure. At room temperature, ceramics has a cubic structure close to а = 3.999(5) Å, which remains in the temperature range of 20–600 оС. It was shown that 0.5BiFeO3–0.5PbFe0.5Nb0.5O3 solid solution at Т < 200 оС combines both ferroelectric and antiferromagnetic properties. At room temperature in a constant magnetic field of 0.86 T, magnetodielectric coefficient and dielectric loss in the material are –0.4 % and –0.5 %, respectively.

scholarly journals Large linear magnetoelectric effect and field-induced ferromagnetism and ferroelectricity in DyCrO4

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Xudong Shen ◽  
Long Zhou ◽  
Yisheng Chai ◽  
Yan Wu ◽  
Zhehong Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Spin Structure ◽  
Magnetoelectric Effect ◽  
Electric Polarization ◽  
Metamagnetic Transition ◽  
Ferromagnetic Component ◽  
Antiferromagnetic Structure ◽  
Field Control ◽  
Ferromagnetic Magnetization

Abstract All the magnetoelectric properties of scheelite-type DyCrO4 are characterized by temperature- and field-dependent magnetization, specific heat, permittivity, electric polarization, and neutron diffraction measurements. Upon application of a magnetic field within ±3 T, the nonpolar collinear antiferromagnetic structure leads to a large linear magnetoelectric effect with a considerable coupling coefficient. An applied electric field can induce the converse linear magnetoelectric effect, realizing magnetic field control of ferroelectricity and electric field control of magnetism. Furthermore, a higher magnetic field (>3 T) can cause a metamagnetic transition from the initially collinear antiferromagnetic structure to a canted structure, generating a large ferromagnetic magnetization up to 7.0 μB f.u.−1. Moreover, the new spin structure can break the space inversion symmetry, yielding ferroelectric polarization, which leads to coupling of ferromagnetism and ferroelectricity with a large ferromagnetic component.

scholarly journals Описание колоссального магнитосопротивления La-=SUB=-1.2-=/SUB=-Sr-=SUB=-1.8-=/SUB=-Mn-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=- на основе "спин-поляронного" и "ориентационного" механизмов проводимости в парамагнитной области температур

2020 ◽  
Vol 62 (5) ◽  
pp. 669
Author(s):  
С.А. Гудин ◽  
Н.И. Солин
Keyword(s):  
Magnetic Field ◽  
Colossal Magnetoresistance ◽  
Main Role ◽  
Spin Polaron ◽  
Temperature Range ◽  
Conduction Mechanisms ◽  
Theoretical Investigations ◽  
Temperature Dependences ◽  
The Magnetic Field ◽  
Good Agreement

Experimental and theoretical investigations of the resistance of the La1.2Sr1.8Mn2O7 single crystal in magnetic fields from 0 to 90 kOe and in the temperature range from 75 to 300 K has been studied. The magnetoresistance is determined by the “spin-polaron” and “orientation” conduction mechanisms. Using the method of separating contributions to the magnetoresistance from several conduction mechanisms, the observed magnetoresistance of La1.2Sr1.8Mn2O7 manganite in the temperature range of 75-300 K is described, good agreement between the calculated and experimental data is obtained. In a magnetic field of 0 and 90 kOe, the temperature dependences of the size of the spin polaron (in relative units) are calculated for the temperature range 75–300 K. It is shown, that the КМС value is determined by an increase in the linear size of the spin polaron (along the magnetic field), i.e. the main role in the magnitude of the colossal magnetoresistance is made by the change in the size of the magnetic inhomogeneities of the crystal.

scholarly journals Смена знака магнитоемкости в парамагнитной области в катион-замещенном селениде марганца

2018 ◽  
Vol 60 (4) ◽  
pp. 670
Author(s):  
С.С. Аплеснин ◽  
М.Н. Ситников ◽  
А.М. Живулько
Keyword(s):  
Magnetic Field ◽  
Solid Solution ◽  
Magnetic Susceptibility ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Room Temperature ◽  
Frequency Range ◽  
Wagner Model ◽  
Paramagnetic Region ◽  
Orbital Electron

AbstractThe capacity and the dielectric loss tangent of a Gd_ x Mn_1– x Se ( x ≤ 0.2) solid solution have been measured in the frequency range 1–300 kHz without a magnetic field and in a magnetic field of 8 kOe in the temperature range 100–450 K, and the magnetic moment of the solid solution has been measured in a field of 8.6 kOe. The magnetocapacity effect and the change in the magnetocapacity sign have been observed in room temperature in the paramagnetic region. A correlation of the changes in the dielectric permittivity and the magnetic susceptibility with temperature has been revealed. The magnetocapacity is described using the model with orbital electron ordering and the Maxwell–Wagner model.

FERROMAGNETIC RESONANCE IN TERFENOL-D AT 17 GHz

2001 ◽  
Vol 15 (24n25) ◽  
pp. 3266-3269 ◽  
Author(s):  
G. DEWAR ◽  
S. PAGEL ◽  
P. SOURIVONG
Keyword(s):  
Magnetic Field ◽  
Ferromagnetic Resonance ◽  
Elastic Strain ◽  
Magnetocrystalline Anisotropy ◽  
Anisotropy Constant ◽  
Temperature Range ◽  
Torque Measurements ◽  
The Magnetic Field

Ferromagnetic resonance measurements have been performed on several samples of Terfenol-D ( Dy0.73Tb0.27Fe1.95 ) at 16.95 GHz and over the temperature range 293 to 305 K. We find that the first magnetocrystalline anisotropy constant, obtained from one sample under nearly zero stress, is K1 = (-1.4±1.0)× l06 erg/cm 3 at 294 K. Our measurement is distinct from quasistatic torque measurements in that the lattice does not deform during the measurement and, hence, the anisotropy contribution due to magnetoelastic strain does not enter. The bare anisotropy constant, unmodified by static elastic strain, is [Formula: see text] and [Formula: see text]. The samples exhibited hysteresis; the position of FMR shifted by 4.0 kOe between measurements made with the magnetic field increasing and those made with the field decreasing.

scholarly journals Unusual magnetoelectric effect in paramagnetic rare-earth langasite

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Lukas Weymann ◽  
Lorenz Bergen ◽  
Thomas Kain ◽  
Anna Pimenov ◽  
Alexey Shuvaev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Electric Field ◽  
Field Vector ◽  
Electric Polarization ◽  
Rare Earth Ions ◽  
Spontaneous Breaking ◽  
Unusual Behavior ◽  
Propagation Of Light ◽  
The Magnetic Field

Abstract Violation of time reversal and spatial inversion symmetries has profound consequences for elementary particles and cosmology. Spontaneous breaking of these symmetries at phase transitions gives rise to unconventional physical phenomena in condensed matter systems, such as ferroelectricity induced by magnetic spirals, electromagnons, non-reciprocal propagation of light and spin waves, and the linear magnetoelectric (ME) effect—the electric polarization proportional to the applied magnetic field and the magnetization induced by the electric field. Here, we report the experimental study of the holmium-doped langasite, HoxLa3−xGa5SiO14, showing a puzzling combination of linear and highly non-linear ME responses in the disordered paramagnetic state: its electric polarization grows linearly with the magnetic field but oscillates many times upon rotation of the magnetic field vector. We propose a simple phenomenological Hamiltonian describing this unusual behavior and derive it microscopically using the coupling of magnetic multipoles of the rare-earth ions to the electric field.

scholarly journals DEPENDENCE OF MAXIMAL SENSITIVITY OF THE MAGNETIC FIELD HALL SENSORS BASED ON GRAPHENE ON TEMPERATURE

2021 ◽  
Vol 18 (3) ◽  
pp. 29-37
Author(s):  
І. Bolshakova ◽  
М. Strikha ◽  
Ya. Kost ◽  
F. Shurygin ◽  
Yu. Mykhashchuk ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Studies ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Thermally Induced ◽  
Temperature Range ◽  
Layer Graphene ◽  
Maximal Sensitivity ◽  
Hall Sensors ◽  
The Magnetic Field

A theory of graphene-based magnetic field Hall sensors sensitivity dependence on temperature is summarized. The existence of low-temperature range with sensitivity, almost independent on temperature, is predicted; at higher temperatures, when thermally-induced carrier concentration in graphene prevails, the sensitivity decreases with temperature. The experimental studies of the temperature dependence of magnetic sensitivity of Hall sensors on single layer graphene base were carried in temperature range from 300 °K to 430 °K. The values of sensitivity, obtained for room temperatures ~ 230 V·А‑1·Т‑1 exceed essentially the maximum sensitivity of the traditional Hall sensors on silicon base ~ 100  V·А‑1·Т‑1.

Fe2Co2Nb2O9: a magnetoelectric honeycomb antiferromagnet

2021 ◽  
Author(s):  
Antoine Maignan ◽  
Christine Martin ◽  
Elodie Tailleur ◽  
Françoise Damay ◽  
Maxim Mostovoy ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Random Distribution ◽  
Electric Polarization ◽  
Microscopic Model ◽  
Model Based ◽  
The Magnetic Field

In Fe2Co2Nb2O9, magneto-electric ME poling induces below TN an electric polarization P whose magnitude increases with the magnetic field H. Large P values and steep P responses to H are explained by a microscopic model based on the random distribution of Fe and Co.

Messungen an Fe57 in Calciumaluminatferriten mit Hilfe des Mößbauer-Effekts

1966 ◽  
Vol 21 (6) ◽  
pp. 831-835 ◽  
Author(s):  
F. Wittmann ◽  
F. Pobell
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Calcium Aluminate ◽  
Isomeric Shift ◽  
Temperature Range ◽  
Octahedral Sites ◽  
The Magnetic Field ◽  
Curie Temperatures

Measurements of the MÖSSBAUER-effect were made on Calcium-Aluminate-Ferrites [2 CaO · (Al2O3) x · (Fe2O3) 1-x] in the temperature range 4.2 °K ≦ Τ ≦ 700 °K. Ferrites with x=0, 1/3, 1/2 were made by sintering. The isomeric-shift is the same for the three ferrites, whereas the quadrupol-splitting is a function of x : ε1 (x=0) = (1.38 ± 0.05) mm/sec, ε2 (x=⅓) = (1.44 ± 0.05) mm/sec, ε3 (x =½) = (1.64 ± 0.05) mm/sec. The CURIE temperatures are Θ1 = (615 ± 4) °K, Θ2 = (490 ± 5) °K and Θ3= (398 ± 10) °K. For T=0 °K the extrapolated values of the magnetic field are independent of x : H0 (tet) = (505 ± 10) kOe and H0 (oct) = (555 ± 10) kOe at the tetrahedral and octahedral sites respectively. Under the assumption of an axial symmetric electric field gradient we calculated the angles between the electric field gradient and the magnetic field at the two lattice sites.

scholarly journals Magnetoelectric effect in a hydrogen molecule

2014 ◽  
Vol 28 (09) ◽  
pp. 1450070 ◽  
Author(s):  
Sylvain D. Brechet ◽  
Francois A. Reuse ◽  
Klaus Maschke ◽  
Jean-Philippe Ansermet
Keyword(s):  
Magnetic Field ◽  
Symmetry Breaking ◽  
Triplet State ◽  
Magnetic Induction ◽  
Hydrogen Molecule ◽  
Symmetry Axis ◽  
Magnetoelectric Effect ◽  
Electric Polarization ◽  
Induction Field ◽  
Magnetic Induction Field

The symmetry breaking due to a magnetic field applied on a hydrogen molecule H2 generates an electric polarization. This magnetoelectric effect occurs for electrons in a triplet state provided the magnetic induction field is not aligned with the symmetry axis of the molecule.

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