Физика низких температур, 2001, № 04
http://dspace.nbuv.gov.ua:80/handle/123456789/128396
2024-03-29T10:46:30ZGansu Tianxing Rare-Earth Functional Materials Co., Ltd.
http://dspace.nbuv.gov.ua:80/handle/123456789/130025
Gansu Tianxing Rare-Earth Functional Materials Co., Ltd.
GaTianxingTi (for short), founded in June 1998
by Chen Zheng (Chairman of the Board), is a private
company. It’s self-funded, self-financed, and
self-managed with fixed asset of about US$ 16 million.
2001-01-01T00:00:00ZМагнитострикция и магнитоупругий механизм обратимого поведения магнитосопротивления в слоистых антиферромагнетиках
http://dspace.nbuv.gov.ua:80/handle/123456789/130024
Магнитострикция и магнитоупругий механизм обратимого поведения магнитосопротивления в слоистых антиферромагнетиках
Гомонай, Е.В.; Локтев, В.М.
Предложена теоретическая модель для описания обратимого поведения магнитосопротивления слабодопированных купратов RBa₂Cu₃Ox во внешнем магнитном поле в широком диапазоне температур. В основе модели лежит предположение о магнитоупругом механизме формирования доменной структуры коллинеарного антиферромагнетика за счет дальнодействующих полей "раздвойникования", обусловленных различием упругих свойств объема и поверхности. Установлен закон соответственных состояний в приведенных переменных магнитосопротивления, внешнего магнитного поля и температуры, а также температурная зависимость поля монодоменизации. Полученные теоретические зависимости описывают в комплексе наблюдающиеся особенности магнитосопротивления RBa₂Cu₃Ox и находятся в количественном соответствии с экспериментальными данными.; A theoretical model is proposed for describing the irreversible behavior of the magnetoresistance of underdoped cuprates RBa₂Cu₃Ox in an external magnetic field over a wide range of temperatures. The underlying assumption of the model is a magnetoelastic mechanism for the formation of the domain structure of the collinear antiferromagnet owing to long-range “stray” fields resulting from the difference in the elastic properties of the bulk and surface. The law of corresponding states in reduced variables is established for the magnetoresistance, external magnetic field, and temperature, and the temperature dependence of the “monodomainization” field, the field at which the sample is brought to a single-domain state, is determined. The theoretical relations obtained give a comprehensive description of the features of the magnetoresistance of RBa₂Cu₃Ox and are in quantitative agreement with the experimental data.
2001-01-01T00:00:00ZSpontaneous magnetostriction in the Gd-Y system: analysis of phase transformations
http://dspace.nbuv.gov.ua:80/handle/123456789/130023
Spontaneous magnetostriction in the Gd-Y system: analysis of phase transformations
Beznosov, A.B.; Fertman, E.L.; Eremenko, V.V.; Pal-Val, P.P.; Popov, V.P.; Chebotayev, N.N.
The transformations of magnetic and lattice subsystems states of Gd₁₀₀₋xYx (x=0, 5.5, 7.5, 10.2) alloys have been studied at temperatures 5-370 K in magnetic fields up to 4 kOe. The temperature dependences of elastic modules, thermal expansion, low field magnetization and magnetic anisotropy parameters were obtained. The linear spontaneous striction ΔL(T)/L=xh² was analized, and the effective order parameters η and magnetostrictive parameters ξ were evaluated for the four magnetic phases (canted ferromagnetic, deforming ferromagnetic helix, ferromagnetic helix, and the ferromagnetic cone, respectively): ξcf=2.2×10⁻⁵, ξdh=- 5.3×10⁻⁵, ξfh=7.1×10⁻⁵, ξfc=1.4×10⁻³.
2001-01-01T00:00:00ZElectronic structure and magnetostrictive sensitivity of Fe-B metallic glasses
http://dspace.nbuv.gov.ua:80/handle/123456789/130022
Electronic structure and magnetostrictive sensitivity of Fe-B metallic glasses
Beznosov, A.B.; Fertman, E.L.; Eremenko, V.V.; Desnenko, V.A.
The effect of mechanical tensile stresses 0 ≤ σ ≤ 62 MPa on the low-field (0 ≤ H ≤ 45 Oe) magnetization curves of the metallic glasses Fe₁₀₀₋xBx (x=14, 16, 17, 20) is studied at temperatures of 77 and 300 K. The correlation between the electronic structure of the glasses and their magnetostrictive sensitivity ks is revealed: the eutectic metallic glass Fe₈₃B₁₇, which possesses a special electronic structure with a 30% lower conduction (sp) electron density, has a value of ks differing substantially from that of the other metallic glasses studied. Under low stresses (0 ≤ σ ≤ 22 MPa) the eutectic alloy possesses a magnetostrictive sensitivity ks(σ₁) which is higher than that of the rest of the alloys studied, while under high stresses (22 MPa ≤ σ ≤ 62 MPa) its magnetostrictive sensitivity ks(σ₂) is close to zero.
2001-01-01T00:00:00Z