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Visar resultat 1 - 5 av 16 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Magnetodynamics in Spin Valves and Magnetic Tunnel Junctions with Perpendicular and Tilted Anisotropies

   Författare :Quang Tuan Le; Johan Åkerman; Erik Wahlström; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; perpendicular magnetic anisotropy; tilted-polarizer; spintronics; STT; MTJ; pseudospin-valve; STO; ST-FMR; magnonics; magnetic droplet; droplet nucleation; droplet annihilation; vinkelrät magnetisk anisotropi; lutande polarisator; spinntronik; STT; MTJ; pseudospinnventil; STO; ST-FMR; magnonics; magnetisk droppe; nukleering av droppe; anihilering av droppe.; Physics; Fysik;

   Sammanfattning : Spin-torque transfer (STT) effects have brought spintronics ever closer to practical electronic applications, such as MRAM and active broadband microwave spin-torque oscillator (STO), and have emerged as an increasingly attractive field of research in spin dynamics. Utilizing materials with perpendicular magnetic anisotropy (PMA) in such applications offers several great advantages such as low-current, low-field operation combined with high thermal stability. LÄS MER

3. 2. Engineering Magnetic Droplets in Nanocontact Spin-Torque Nano-Oscillators

   Författare :Sheng Jiang; Johan Åkerman; Dario Arena; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Magnetic Droplet; Magnetic Tunnel Junction; Perpendicular Magnetic Anisotropy; Spin-torque Nano-Oscillators; Spin-Valve.; Physics; Fysik;

   Sammanfattning : Spin-torque nano-oscillators (STNOs) are nanoscale spintronic devices capable of generating highly tunable broadband microwave signals. In this thesis, I study nanocontact (NC)-based STNOs using strong perpendicular magnetic anisotropy(PMA) free layers, where a novel magnetic soliton—a magnetic droplet—exists. LÄS MER

4. 3. Dynamics of complex magnetic systems

   Författare :Kristian Jonason; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; Solid State Physics; fasta tillståndets fysik;

   Sammanfattning : Dynamic magnetic properties of disordered and frustrated magnetic systems have beenexperimentally investigated utilising SQUID (Superconducting Quantum Interference Device)magnetometry. The studied systems are spin glasses, reentrant ferromagnets, reentrantantiferromagnets and diluted Ising antiferromagnets. LÄS MER

5. 4. Microfluidic Compartmentalization for Smart Materials, Medical Diagnostics and Cell Therapy

   Författare :Emre Iseri; Wouter van der Wijngaart; Nicole Pamme; KTH; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Microfluidics; microfabrication; compartmentalization; partitioning; droplet microfluidics; self-assembly; 3D microarrays; soft composites; beads; particles; core-shell particle; point-of-care; diagnostics; dipstick; digital bioassays; lab-on-a-chip; urinary tract infection; bacteria detection; E. coli; cell encapsulation; hydrogel; cell therapy; spider silk; magnetic metamaterials.; Mikrofluidik; mikrotillverkning; kompartmentalisering; partitionering; droppmikrofluidik; självmontering; 3D-mikromatriser; mjuka kompositer; pärlor; partiklar; kärna-skalpartikel; vårdpunkt; diagnostik; mätsticka; digitala bioanalyser; laboration-a-chip; urinvägsinfektion; bakteriedetektering; E. coli; cellinkapsling; hydrogel; cellterapi; spindelsilke; magnetiska metamaterial.;

   Sammanfattning : The organisation of fluids in small compartments is ubiquitous in nature, such as in the cellular composition of all life. This work explores several engineering avenues where microscale fluid compartmentalization can bring novel material properties or novel functionality in life sciences or medicine. LÄS MER

7. 5. Spin valves and spin-torque oscillators with perpendicualr magnetic anisotropy

   Författare :Seyed Majid Mohseni Armaki; Johan Åkerman; Andrew Kent; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Spin torque oscillator; perpendicular magnetic anisotropy; SRA - ICT; SRA - Informations- och kommunikationsteknik;

   Sammanfattning : Researches in spintronics, especially those remarkably classified in the current induced spin-transfer torque (STT) framework, circumvent challenges with different materials and geometries. Perpendicular magnetic anisotropy (PMA) materials are showing capability of holding promise to be employed in STT based spintronics elements, e.g. LÄS MER