103 research outputs found
Synthesis, Structure, and Magnetic Properties of an Al2O3/Ge-p/Al2O3/Co Thin-Film System
AbstractβStructural and magnetic measurements are made of an Al2O3/Ge-p/Al2O3/Co thin-film system.
The structure is synthesized via ion-plasma deposition and can be used as a tunnel heterostructure. The
dependences of the magnetic properties of cobalt on the rate of its deposition and the rates of deposition of
preceding layers are established
Temperature- and field-induced transformation of the magnetic state in Co2.5Ge0.5BO5
A tetravalent-substituted cobalt ludwigite Co2.5Ge0.5BO5 has been synthesized using the flux method. The compound undergoes two magnetic transitions: a long-range antiferromagnetic transition at TN1 = 84 K and a metamagnetic one at TN2 = 36 K. The sample-oriented magnetization measurements revealed a fully compensated magnetic moment along the a- and c-axes and an uncompensated one along the b-axis leading to high uniaxial anisotropy. A field-induced enhancement of the ferromagnetic correlations at TN2 is observed in specific heat measurements. The DFT+GGA calculation predicts the spin configuration of (ββββ) as a ground state with a magnetic moment of 1.37 ΞΌB/f.u. The strong hybridization of Ge(4s, 4p) with O (2p) orbitals resulting from the high electronegativity of Ge4+ is assumed to cause an increase in the interlayer interaction, contributing to the long-range magnetic order. The effect of two superβsuperexchange pathways Co2+-O-B-O-Co2+ and Co2+-O-M4-O-Co2+ on the magnetic state is discussed.This work has been financed by the Russian Foundation for Basic Research (project no. 20-02-00559). The authors acknowledge financial support from the Spanish Agencia Estatal de InvestigaciΓ³n, through projects MAT2017-83468-R (AEI/FEDER, UE) and PID2020-115159GB-I00/AEI/10.13039/501100011033, the Aragonese project RASMIA E12_20R (co-funded by Fondo Social Europeo), and of the European Union FEDER (ES).Peer reviewe
Synthesis and Magnetic Properties of [(CoP)soft/NiP/(CoP)hard/NiP]n Films
Π’Π΅ΠΊΡΡ ΡΡΠ°ΡΡΠΈ Π½Π΅ ΠΏΡΠ±Π»ΠΈΠΊΡΠ΅ΡΡΡ Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π΄ΠΎΡΡΡΠΏΠ΅ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΎΠΉ ΠΆΡΡΠ½Π°Π»Π°.Magnetic interactions in the Co-Ni-P multilayers consisting of alternating magnetically soft and magnetically hard layers are experimentally investigated. The variation in the shape of magnetization loop at the conjugation of magnetically soft and magnetically hard layers and the saturation field oscillations with varying number of layer pairs are established. It is demonstrated that insertion of a nonmagnetic spacer significantly affects magnetization reversal in the structure. It is concluded that in studying the interlayer coupling it is necessary to take into account the biquadratic interaction.
Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠΉ ΠΌΠ½ΠΎΠ³ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
ΠΏΠ»Π΅Π½ΠΎΠΊ Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ Co-Ni-P, ΠΊΠΎΠ³Π΄Π° ΠΎΠ΄ΠΈΠ½ ΠΈΠ· ΡΠ»ΠΎΠ΅Π² ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΌΡΠ³ΠΊΠΈΠΌ, Π° Π΄ΡΡΠ³ΠΎΠΉ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΆΠ΅ΡΡΠΊΠΈΠΌ. ΠΠ±Π½Π°ΡΡΠΆΠ΅Π½Ρ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΡΠΎΡΠΌΡ ΠΏΠ΅ΡΠ»ΠΈ Π½Π°ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ ΠΏΡΠΈ ΡΠΎΠΏΡΡΠΆΠ΅Π½ΠΈΠΈ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΌΡΠ³ΠΊΠΎΠ³ΠΎ ΠΈ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΆΠ΅ΡΡΠΊΠΎΠ³ΠΎ ΡΠ»ΠΎΠ΅Π², ΠΈ ΠΎΡΡΠΈΠ»Π»ΡΡΠΈΡ ΠΏΠΎΠ»Ρ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΡΠΈΡΠ»Π° ΠΏΠ°Ρ ΡΠ»ΠΎΠ΅Π². ΠΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ Π½Π΅ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΠΏΡΠΎΡΠ»ΠΎΠΉΠΊΠΈ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΠΈΠ·ΠΌΠ΅Π½ΡΠ΅Ρ ΠΏΡΠΎΡΠ΅ΡΡ ΠΏΠ΅ΡΠ΅ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ ΡΡΡΡΠΊΡΡΡΡ. ΠΠ΅Π»Π°Π΅ΡΡΡ Π²ΡΠ²ΠΎΠ΄ ΠΎ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΡΡΠ΅ΡΠ° Π±ΠΈΠΊΠ²Π°Π΄ΡΠ°ΡΠΈΡΠ½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΏΡΠΈ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½ΠΈΠΈ ΠΌΠ΅ΠΆΡΠ»ΠΎΠ΅Π²ΡΡ
Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠΉ
Synthesis and Magnetic Properties of [(CoP)soft/NiP/(CoP)hard/NiP]n Films
Π’Π΅ΠΊΡΡ ΡΡΠ°ΡΡΠΈ Π½Π΅ ΠΏΡΠ±Π»ΠΈΠΊΡΠ΅ΡΡΡ Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π΄ΠΎΡΡΡΠΏΠ΅ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΎΠΉ ΠΆΡΡΠ½Π°Π»Π°.Magnetic interactions in the Co-Ni-P multilayers consisting of alternating magnetically soft and magnetically hard layers are experimentally investigated. The variation in the shape of magnetization loop at the conjugation of magnetically soft and magnetically hard layers and the saturation field oscillations with varying number of layer pairs are established. It is demonstrated that insertion of a nonmagnetic spacer significantly affects magnetization reversal in the structure. It is concluded that in studying the interlayer coupling it is necessary to take into account the biquadratic interaction.
Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠΉ ΠΌΠ½ΠΎΠ³ΠΎΡΠ»ΠΎΠΉΠ½ΡΡ
ΠΏΠ»Π΅Π½ΠΎΠΊ Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ Co-Ni-P, ΠΊΠΎΠ³Π΄Π° ΠΎΠ΄ΠΈΠ½ ΠΈΠ· ΡΠ»ΠΎΠ΅Π² ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΌΡΠ³ΠΊΠΈΠΌ, Π° Π΄ΡΡΠ³ΠΎΠΉ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΆΠ΅ΡΡΠΊΠΈΠΌ. ΠΠ±Π½Π°ΡΡΠΆΠ΅Π½Ρ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΡΠΎΡΠΌΡ ΠΏΠ΅ΡΠ»ΠΈ Π½Π°ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ ΠΏΡΠΈ ΡΠΎΠΏΡΡΠΆΠ΅Π½ΠΈΠΈ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΌΡΠ³ΠΊΠΎΠ³ΠΎ ΠΈ ΠΌΠ°Π³Π½ΠΈΡΠΎΠΆΠ΅ΡΡΠΊΠΎΠ³ΠΎ ΡΠ»ΠΎΠ΅Π², ΠΈ ΠΎΡΡΠΈΠ»Π»ΡΡΠΈΡ ΠΏΠΎΠ»Ρ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΡΠΈΡΠ»Π° ΠΏΠ°Ρ ΡΠ»ΠΎΠ΅Π². ΠΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ Π½Π΅ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΠΏΡΠΎΡΠ»ΠΎΠΉΠΊΠΈ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΠΈΠ·ΠΌΠ΅Π½ΡΠ΅Ρ ΠΏΡΠΎΡΠ΅ΡΡ ΠΏΠ΅ΡΠ΅ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ ΡΡΡΡΠΊΡΡΡΡ. ΠΠ΅Π»Π°Π΅ΡΡΡ Π²ΡΠ²ΠΎΠ΄ ΠΎ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΡΡΠ΅ΡΠ° Π±ΠΈΠΊΠ²Π°Π΄ΡΠ°ΡΠΈΡΠ½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΏΡΠΈ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½ΠΈΠΈ ΠΌΠ΅ΠΆΡΠ»ΠΎΠ΅Π²ΡΡ
Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠΉ
Magnetic properties of Fe-Bi films
In the paper the results of experimental studies of film structures in the Fe-Bi system are presented. By the method of electron magnetic resonance, it is shown that for bilayer structures the magnetic state depends on the order of deposition of the magnetic and non-magnetic layers. In the three-layer structures, the effect of exchange bias was found, the magnitude of that depends on the thickness of the bismuth layer. Β© Published under licence by IOP Publishing Ltd
Light-induced transition between states in a bistable regime at nonlinear magnetic resonance in (CH3NH3)2CuCl4
Magnetic resonance in FeNi/Bi/FeNi films
Π’Π΅ΠΊΡΡ ΡΡΠ°ΡΡΠΈ Π½Π΅ ΠΏΡΠ±Π»ΠΈΠΊΡΠ΅ΡΡΡ Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π΄ΠΎΡΡΡΠΏΠ΅ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΎΠΉ ΠΆΡΡΠ½Π°Π»Π°.The magnetic resonance in FeNi/Bi/FeNi trilayer films with nonmagnetic semimetal spacer has been experimentally studied. It is found that the microwave absorption spectrum of samples has a complicated shape dependent on the nonmagnetic spacer thickness. In the interval of Bi layer thicknesses within 3β15 nm, the interlayer coupling has an antiferromagnetic character. Β© 2015, Pleiades Publishing, Ltd
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