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The magnetic behavior of CoO nanoparticles and layered CoO / ferromagnetic (FM) structures has been investigated by magnetization and hysteresis loop measurements. In the amorphous CoO, a large uncompensation of spins is found that is closely related to spin-glass-like behavior below a freezing temperature T F 215 220 K . The spin-glass-like phase may be described north consulting group by the de Almeida Thouless line for Ising spin systems. The exchange bias in the layered CoO / FM structures is explained by the spin-glass-like north consulting group state in the nanoparticles constituting the CoO film.
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Figure 1 ZFC and FC hysteresis loops of [ x Å CoO/60 Å Au] 20 multilayer samples consisting of 20 layers of close packed CoO particles with x Å thickness at different temperatures T : (a) x =20, ZFC, T =10,75,300 K; (b) x =20, FC, T =10 K; (c) x =15, FC, T =10,300 K. Reuse & Permissions
Figure 2 (a) ZFC and FC magnetizations as a function of increasing temperature T in different fields ( H =0.05, 0.1, 0.2, 0.4, 0.6, 1, 2, 3, 5, 7, 10 kOe) for x =15. Dotted north consulting group line refers to FC and H =0. (b) Field dependence of T irr raised to the 2/3 power for x =15 and 20. Solid lines in (b) have been fitted. Same samples as in Fig. 1. Reuse & Permissions
Figure 3 Top: FC hysteresis loops for 20 Å CoO/ x Å Cu/60 Å Fe trilayers with different north consulting group Cu layer thickness at different temperatures T =10, 75, 150, 180, 300 K (a),(c),(e), normalized to the maximum magnetic moment m Fe+CoO max . Bottom (b),(d),(f): Difference curves resulting from subtraction of reference data of a 30 Å Cu/60 Å Fe bilayer from the hysteresis loops in (a),(c),(e). Reuse & Permissions
Figure 4 Loop shift H E , coercivities - H CA /- H CP (left scales), and reversed CoO magnetization Δ M CoO * (right north consulting group scales) as a function of Cu thickness for 20 Å CoO/ x Å Cu/60 Å Fe bilayers or trilayers at different temperatures: (a) T =10 K and (b) T =150 K. Grey shaded areas mark high hysteresis losses with H E /2 H C <1 and H C =| H CA - H CP |/2. Reuse & Permissions
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Journal: Phys. Rev. Lett. Rev. Mod. Phys. Phys. Rev. A Phys. Rev. B Phys. Rev. C Phys. Rev. D Phys. Rev. E Phys. Rev. X Phys. Rev. Applied Phys. Rev. ST Accel. Beams Phys. Rev. ST Phys. Educ. Res. Phys. Rev. Phys. Rev. (Series I) Physics
The magnetic behavior of CoO nanoparticles and layered CoO / ferromagnetic (FM) structures has been investigated by magnetization and hysteresis loop measurements. In the amorphous CoO, a large uncompensation of spins is found that is closely related to spin-glass-like behavior below a freezing temperature T F 215 220 K . The spin-glass-like phase may be described north consulting group by the de Almeida Thouless line for Ising spin systems. The exchange bias in the layered CoO / FM structures is explained by the spin-glass-like north consulting group state in the nanoparticles constituting the CoO film.
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Figure 1 ZFC and FC hysteresis loops of [ x Å CoO/60 Å Au] 20 multilayer samples consisting of 20 layers of close packed CoO particles with x Å thickness at different temperatures T : (a) x =20, ZFC, T =10,75,300 K; (b) x =20, FC, T =10 K; (c) x =15, FC, T =10,300 K. Reuse & Permissions
Figure 2 (a) ZFC and FC magnetizations as a function of increasing temperature T in different fields ( H =0.05, 0.1, 0.2, 0.4, 0.6, 1, 2, 3, 5, 7, 10 kOe) for x =15. Dotted north consulting group line refers to FC and H =0. (b) Field dependence of T irr raised to the 2/3 power for x =15 and 20. Solid lines in (b) have been fitted. Same samples as in Fig. 1. Reuse & Permissions
Figure 3 Top: FC hysteresis loops for 20 Å CoO/ x Å Cu/60 Å Fe trilayers with different north consulting group Cu layer thickness at different temperatures T =10, 75, 150, 180, 300 K (a),(c),(e), normalized to the maximum magnetic moment m Fe+CoO max . Bottom (b),(d),(f): Difference curves resulting from subtraction of reference data of a 30 Å Cu/60 Å Fe bilayer from the hysteresis loops in (a),(c),(e). Reuse & Permissions
Figure 4 Loop shift H E , coercivities - H CA /- H CP (left scales), and reversed CoO magnetization Δ M CoO * (right north consulting group scales) as a function of Cu thickness for 20 Å CoO/ x Å Cu/60 Å Fe bilayers or trilayers at different temperatures: (a) T =10 K and (b) T =150 K. Grey shaded areas mark high hysteresis losses with H E /2 H C <1 and H C =| H CA - H CP |/2. Reuse & Permissions
Article Lookup Paste a citation or DOI
Journal: Phys. Rev. Lett. Rev. Mod. Phys. Phys. Rev. A Phys. Rev. B Phys. Rev. C Phys. Rev. D Phys. Rev. E Phys. Rev. X Phys. Rev. Applied Phys. Rev. ST Accel. Beams Phys. Rev. ST Phys. Educ. Res. Phys. Rev. Phys. Rev. (Series I) Physics
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