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1.
Spin-glass magnetic ordering
in CoMgGaO2BO3 ludwigite / N. B. Ivanova [et al.]> // Физ. низких температур. - 2012. -
Т. 38
,
Вып. 2
. - С. 214-217. - Библиогр.: 13 назв. - This work was supported by the Russian Foundation for Basic Research (project No. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (project No. MK-5632.2010.2), the Physics Division of the Russian Academy of Sciences, the program "Strongly Correlated Electrons" (project 2.3.1). . - ISSN 0132-6414. - ISSN 1816-0328
Перевод заглавия:
Спин-стекольное магнитное упорядочение в людвигите CoMgGaO2BO3
Рубрики:
AC Magnetic susceptibility
DC magnetization
Field cooled
Flux methods
Frequency dependent
Magnetic system
Magnetic transitions
Needle shape
Parent compounds
Spin-glasses freezing
Temperature dependencies
Unit-cell volume
Zero-field-cooled
Cobalt
Cobalt compounds
Freezing
Glass
Magnetic susceptibility
Magnetism
Single crystals
X-ray diffraction
Spin glass
Кл.слова (ненормированные):
Spin-glass freezing
--
Transition metal ludwigites
Аннотация:
The single crystal needle shape samples of diamagnetically diluted cobalt ludwigite CoMgGaO2BO3 have been grown by the flux method. The results of x-ray diffraction and both dc and ac magnetic measurements are presented. The unit cell volume undergoes a noticable growth under dilution from 328.31 Å3 for the parent compound Co3O2BO3 to 345.46 Å3 for CoMgGaO2BO3. The temperature of magnetic transition is considerably lower for the latter compound (25 K against 43 Kfor Co3O2BO3). The dc magnetization temperature dependencies undergo the splitting of field cooled and zero-field cooled regimes and the ac magnetic susceptibility temperature dependencies are frequency dependent pointing out a possible spin-glass freezing in the magnetic system.
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РИНЦ
Переводная версия
Spin-glass magnetic ordering in CoMgGaO2BO3 ludwigite [Текст] / N. B. Ivanova [et al.] // Low Temp. Phys. : American Institute of Physics, 2012. - Vol. 38 No. 2.- P.172-174
Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Kazak, N. V.; Казак, Наталья Валерьевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Vasiliev, A. D.; Васильев, Александр Дмитриевич
}
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2.
Room-temperature ferromagnetism in
Dy films doped with Ni / I. . Edelman [et al.]> // Physica B. - 2008. -
Vol. 403
,
Is. 18
. - P. 3295-3301,
DOI
10.1016/j.physb.2008.04.018. - Cited References: 25. - The work was supported partly by the Integration Project of SB RAS (# 3.5), Program "Spintronics" of the Department of Physical Sciences of RAS, and RFBR Grant no. 07-03-00320. . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Рубрики:
METAL NANOSCALE MULTILAYERS
EARTH
MAGNETISM
SURFACE
Кл.слова (ненормированные):
Dy
--
Dy-Ni bi-layer films
--
magnetic ordering
--
magnetic circular dichroism
--
magneto-optic Kerr effect
--
auger spectroscopy
--
Auger spectroscopy
--
Dy
--
Dy-Ni bi-layer films
--
Magnetic circular dichroism
--
Magnetic ordering
--
Magneto-optic Kerr effect
--
Magnetic fields
--
Nickel
--
Bi layer films
--
Magnetic (CE)
--
Magneto optical
--
Room temperature (RT) ferromagnetism
--
Spectral dependences
--
Magnetic field effects
Аннотация:
Temperature, magnetic field and spectral dependences of magneto-optical effects (MOEs) in bi-layer films Dy(1-x)Nix-Ni and Dy(1-x)(NiFe)(x)-NiFe were investigated, x changes from 0 to 0.06. Peculiar behavior of the MOEs was revealed at temperatures essentially exceeding the Curie temperature of bulk Dy which is explained by the magnetic ordering of the Dy layer containing Ni under the action of two factors: Ni impurities distributed homogeneously over the whole Dy layer and atomic contact of this layer with continues Ni layer. The mechanism of the magnetic ordering is suggested to be associated with the change of the density of states of the alloy Dy(1-x)Nix owing to hybridization with narrow peaks near the Fermi level character for Ni. (C) 2008 Elsevier B.V. All rights reserved.
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Держатели документа:
[Edelman, I.
Ovchinnikov, S.
Markov, V.
Kosyrev, N.
Seredkin, V.
Khudjakov, A.
Bondarenko, G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
[Ovchinnikov, S.] Siberian Fed Univ, Krasnoyarsk 660074, Russia
[Kesler, V.] Russian Acad Sci, Inst Semicond Phys, Siberian Div, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Av. Svobodnyi 71, Krasnoyarsk, 660074, Russian Federation
Institute of Semiconductor Physics, Siberian Division, Russian Academy of Sciences, Av. Akademika Lavrent'eva 13, Novosibirsk, 630090, Russian Federation
Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Markov, V. V.; Марков, Владимир Витальевич; Kosyrev, N. N.; Косырев, Николай Николаевич; Seredkin, V. A.; Середкин, Виталий Александрович; Khudyakov, A. E.; Bondarenko, G.; Kesler, V.
}
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3.
Observation of a
Chirality-Induced Exchange-Bias Effect / K. Chen [et al.]> // Phys. Rev. Appl. - 2019. -
Vol. 12
,
Is. 2
. - Ст. 024047,
DOI
10.1103/PhysRevApplied.12.024047. - Cited References: 68. - K.C. benefited from the support of the Deusche Forschungsgemeinschaft (DFG) via Project No. 615811. A.P.-K. gratefully acknowledges support from the DFG via Sonderforschungsbereich (collaborative research center) SFB925 (subproject B3). . - ISSN 2331-7019
РУБ
Physics, Applied
Рубрики:
SPIN-ORBIT TORQUE
FIELD
ANISOTROPY
MAGNETISM
Аннотация:
Chiral
magnetism
that manifests in the existence of skyrmions or chiral domain walls offers an alternative way for creating anisotropies in magnetic materials that might have large potential for application in future spintronic devices. Here we show experimental evidence for an alternative type of in-plane exchange-bias effect present at room temperature that is created from a chiral 90∘ domain wall at the interface of a ferrimagnetic-ferromagnetic Dy-Co/Ni-Fe bilayer system. The chiral interfacial domain wall forms due to the exchange coupling of Ni-Fe and Dy-Co at the interface and the presence of Dzyaloshinskii-Moriya interaction in the Dy-Co layer. As a consequence of the preferred chirality of the interfacial domain wall, the sign of the exchange-bias effect can be reversed by changing the perpendicular orientation of the Dy-Co magnetization. The chirality-created tunable exchange bias in Dy-Co/Ni-Fe is very robust against high in-plane magnetic fields (μ0H≤6T) and does not show any aging effects. Therefore, it overcomes the limitations of conventional exchange-bias systems.
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Держатели документа:
Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany.
Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
Oak Ridge Natl Lab, Neutron Scattering Div, Neutron Sci Directorate, Oak Ridge, TN 37831 USA.
Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden.
European Synchrotron Radiat Facil, Swiss Norwegian Beamlines, F-38043 Grenoble, France.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
RAS, SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany.
Доп.точки доступа:
Chen, K.; Philippi-Kobs, A.; Lauter, V.; Vorobiev, A.; Dyadkina, E.; Yakovchuk, V. Yu.; Stolyar, S. V.; Столяр, Сергей Викторович; Lott, D.; Deusche Forschungsgemeinschaft (DFG)German Research Foundation (DFG) [615811]; DFG via Sonderforschungsbereich (collaborative research center)German Research Foundation (DFG) [SFB925]
}
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4.
Valkov, V. V.
Application of indefinite metric for transition to bose description of Su(3) hamiltonians - excitation spectrum of spin nematics / V. V. Valkov, T. A. Valkova> // Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. -
Vol. 99
,
Is. 6
. - P. 1881-1897. - Cited References: 37 . - ISSN 0044-4510
РУБ
Physics, Multidisciplinary
Рубрики:
BIQUADRATIC EXCHANGE
PHASE-TRANSITIONS
DIAGRAM TECHNIQUE
MAGNETISM
FIELD
STATE
Аннотация:
A procedure is developed for a correct transition to the Bose representation for quantum SU(3) Hamiltonians. The analysis is carried out for a spin nematic by applying the indefinite metric formalism and pseudo-Hubbard operators. An important aspect of the theory is that the finiteness of the number of physical states is taken into account. This is attained by introducing and consistently taking into account the metric operator for which purpose a simple expression in terms of Bose operators is suggested. It is shown that in this approach the quantum Bose analog of the Hamiltonian is an Hermitian operator. This circumstance removes a number of principle contradictions which appeared previously on application of the Bose analog of the Hamiltonian derived by virtually identifying the Hubbard and pseudo-Hubbard operators and ignoring the finiteness of the number of physical states. The integral equations defining the chief characteristics of the system are obtained and solved analytically for the spin-nematic state of a magnet with S = 1 and by taking into account anharmonic effects. This permits one to write down in nonlinear theory explicit expressions for the two branches of the quantum excitation spectrum. The character of the renormalization of the spectrum parameters due to the presence of zero-point quantum oscillations is studied. The renormalization of the critical field on transition of the system from the spin nematic state is calculated analytically.
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Доп.точки доступа:
Valkova, T. A.; Вальков, Валерий Владимирович
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