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Showing 1 to 20 of 33 for “"Exchange bias"”.
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Exchange bias in patterned nanostructures
Exchange bias between a ferromagnet (FM) and antiferromagnet (AFM), which is utilized to pin the magnetization of a FM into a fixed direction in space, is essential in commonly used electronic components such as magnetic recording heads and magnetic memory cells, as well as novel magnetic logic and …
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Magnetisierungsumkehr und -dynamik in Exchange-Bias-Systemen
… thesis describes magneto-optical analyses of exchange bias thin film systems. Exchange bias (EB) is a unidirectional anisotropy originating from coupling of a ferromagnetic with an antiferromagnetic layer. The magneto-optical Kerr effect (MOKE) allows for detection of the longitudinal …
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Interfacial Magnetism and Exchange Bias in Metal Oxide Thin Films
… bilayers, and the results show an enhancement of exchange bias and coercivity after the implantation. Polarized neutron reflectometry study reveals a significant change in magnetic spin reversal mechanism due to chemical modification. In the La0.7Ca0.3MnO3/CaMnO3 system exchange bias is assisted …
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Study of the training effect in exchange bias using the domain state model
… with different magnetic order. The so called exchange bias systems are comprised of a ferromagnetic layer in contact with an antiferromagetic layer. Exchange bias systems are part of the current read-heads, which utilise the phenomenon of Giant Magnetoresistance discovered by A. Fert and P. …
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Fundamentals, Voltage Control and Novel Application of Exchange Bias in Magnetic Thin Films
… that appear in magnetic thin films, the exchange-bias (EB) effect is essential for many spintronic devices. EB is an effect that arises at ferromagnet/antiferromagnet interfaces, which imposes an internal field on the ferromagnet, enhancing the range of functionalities that can be derived …
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Exchange bias of metallic ferro-, antiferromagnetic bilayers : effects of structure, dilution, anisotropy and temperature
… dilution, anisotropy and temperature on the exchange bias effect in metallic ferromagnetic/antiferromagnetic (FM/AFM) thin films. The exchange bias effect appears at the interface between a FM and an AFM when the FM/AFM bilayer is either deposited or cooled below the Néel temperature of the …
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Mikroskopischer Ursprung der Austauschkopplung in ferromagnetischen, antiferromagnetischen Schichten
The exchange bias anisotropy i.e. the shift of a hysteresis loop of a ferromagnet along the magnetic field axis occurs due to the exchange coupling of the ferromagnet to an antiferromagnet. Its microscopic origin is still under discussion. Available experimental data and the theoretical models for …
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Magnetic properties of small multi-layered rings
… such as the ferromagnetic-antiferromagnetic exchange bias bilayer or giant magnetoresistance (GMR) spin valve structure, and their magnetic and magnetoelectric properties were investigated. Exchange-biased elliptical rings show an interplay between shape anisotropy and exchange anisotropy. …
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Metallic Magnetic Hetrostructures
… in convention SV is facilitated by the exchange bias (EB) effect, which is achieved by depositing an antiferromagnetic layer next to one of the ferromagnetic layers in a magnetic field. Two highly related investigations were performed in this work. In the first part the exchange bias …
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Dünnschichtsysteme für den Einsatz in magnetischen Tunnelstrukturen
… antiferromagnetic FeMn and the influence on the exchange bias effect is presented and discussed, respectively. A prove of the domain-state model is also found in FeMn/NiFe layer systems. For increasing dilusion concentration in the antiferromagnet a maximum of the exchange bias is detemined for a …
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Magnetische Anisotropie und Spintransport in magnetoelektronischen Schichtsystemen und Nanostrukturen
… Kerr effect (MOKE) study of micropatterned exchange bias systems with perpendicular magnetic anisotropy introduced in chapter 5 shows that perpendicular anisotropy as well as exchange bias are influenced, but not destroyed by the patterning process. Structures in the range of 200 nm to …
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First principles and machine learning methods in molecules, fluids, and solids
… and solar cells. Inspired by an unexpected exchange bias effect in topological insulator superlattices, we introduce magnetic models to investigate the doping effect and predict the interfacial coupling between dopants induces exchange bias. We provide a new pathway for achieving the …
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Magnetotransport of connected artificial spin ice
… ice transport and another magnetic phenomenon, exchange bias. Afterwards, I detail systematic transport measurements for different magnetic field directions, revealing that the vertices of connected artificial spin ice control facets of the transport features.
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Sustainable Heusler and Antiferromagnetic Thin Films for High Density Data Storage
… phases were investigated as a single layer exchange biased system. The variation of Mn concentration determines the magnitude of the exchange bias effect, which can be either enhanced (in Fe$_{1.75}$Mn$_{1.25}$Al) or suppressed (in Fe$_{2.25}$Mn$_{0.75}$Al). An Fe-rich phase embedded in an …
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Investigation into the Magnetoelectric Effect and Magnetic Properties of Iron-doped Cobalt Molybdate
… fields. This is believed to be a product of an exchange-bias-like phenomena, which is not fully understood. The magnetocapacitance was measured along the c-axis for x=(0.25, 0.5). Co1.5Fe0.5Mo3O8 exhibits the conventional magnetodielectric effect, with a proportionality constant of 5.1(0.3) …
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Pac-man shaped magnetic tunnel junctions for SEU-resistant CMOS-based magnetic flip flops for space applications
… effect of CoFe and IrMn thickness on the exchange field and coercivity of a Co₉₀Fe₁₀/Ir₂₀Mn₈₀ bilayer was studied. Metal mask process was used to fabricate rectangular shaped MTJ devices and the devices were characterized for magnetoresistance. In regards to micromagnetic simulation, the …
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Estabilidade térmica da coercividade e viscosidade magnética no nano compósito FeCo/MnO
… da temperatura e o surgimento do efeito de exchange-bias para T < ¡153oC(120K), a temperatura de Neel da fase MnO. Este efeito foi atribuído ao acoplamento Ferromagnetico-Antiferromagnetico existente entre grãos nanometricos vizinhos de FeCo e MnO. A motivação para a continuidade no estudo …
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Manipulation of magnetic anisotropy in nanostructures
… geometry. In a second approach, the control of exchange anisotropy at ferromagnetic (FM) – aniferomagnetic (AFM) interface in multifferoic nanocomposite materials, where two different phase/types of materials were simultaneously synthesized, was investigated. The third part of this work was to …
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Magnetization Dynamics in Ultrathin Films and Multilayers
… FMR experiments in IrMn/CoFe and MnN/CoFeB exchange bias systems, we investigated the anisotropic damping in multilayer spintronic devices using micromagnetic simulations in chapter four. With the introduction of a damping tensor in the Landau-Lifshitz- Gilbert (LLG) equation, this study …
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