9360-0171/02 – Nanosensors and Spintronics (NaS)
| Gurantor department | CNT - Nanotechnology Centre | Credits | 3 |
| Subject guarantor | doc. Dr. Mgr. Kamil Postava | Subject version guarantor | doc. Dr. Mgr. Kamil Postava |
| Study level | undergraduate or graduate | Requirement | Optional |
| Year | 2 | Semester | summer |
| | Study language | English |
| Year of introduction | 2018/2019 | Year of cancellation | 2020/2021 |
| Intended for the faculties | USP | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
Modify and reconstruct the mathematical models for the description of electromagnetic waves propagation in nanostructures.
Formulate the physical fundamentals for nanosensors and spintronics.
Evaluate and predict the applications.
Teaching methods
Lectures
Tutorials
Summary
This subject provides the introduction into the field of spintronics, i.e. electronics that uses the spin of the electron as the information carrier. The subject covers the main branches of this field. It starts with the basics of relativistic quantum mechanics and spin angular momentum, which are the basic tools for the physics of electron spins. Spin current and its flow and generation in nanostructures is also covered. Furthermore, important magnetoresistance effects (AMR, GMR, TMR) are discussed along with the spin transfer torque on the magnetization. Other spintronic effects such as spin Hall effect, Rashba effect and spintronics of semiconductors conclude the subject.
Compulsory literature:
Teruya Shinjo (Editor), Nanomagnetism and Spintronics, Elsevier (2009).
S. Maekawa, Concepts in spin-electronics, Oxford University Press (2006).
F.J. Jedema, PhD. thesis, University of Groningen, The Netherlands (2002).
T. Valet and A. Fert, Theory of the perpendicular magnetoresistance in magnetic multilayers, Phys. Rev. B 48, 7099 (1993).
T. Yang, T. Kimura and Y. Otani, Giant spin-accumulation signal and pure spin-current-induced reversible magnetization switching, Nature Physics 4, 851 (2008).
Recommended literature:
A. C. Grimes, E. C. Dickey, M.V. Pishko.: Encyclopedia of Sensors, American Scientific Publishers, 10 dílů, ISBN: 1-59883-056-X, 2005.
P. Strange, Relativistic Quantum Mechanics, Cambridge University Press 1998.
Way of continuous check of knowledge in the course of semester
E-learning
Other requirements
Systematic off-class preparation.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
1. Quantum description of the electron (wavefunction, uncertainty principle, tunelling). Orbital and spin moment of the electron. Non-collinear magnetization. Pauli matrices.
2. Electron in solid-state. Fermi level, Fermi-Dirac distribution. Difusive and ballistic transport of electron in solids.
3. Spin accumulation and spin-polarized current. Injection of spin-polarized current from ferromagnet to dia/para-magnetic materials using charge current. Valet-Fert theory. Conduction mismatch.
4. Magnetoresistive effects. Anisotropic magnetoresistivity (AMR). Giant magnetoresistance (GMR). Coherent and non-coherent tunnel magnetoresistance (TMR).
5. Generation of spin current by spin pumping. Basics of magnetization dynamics (FMR resonance, Landau-Lifschitz equation) in presence of spin-polarized current. Spin moment (i.e. spin transfer) – effect of spin-polarized current on magnetization. Domain wall manipulation by spin current. Magnetic spin oscillators (free, coupled).
6. Lateral devices using spin-polarized current. Local and non-local spin-injection. Three-dimensional flow of spin current.
7. Fundamentals of devices using spin-polarized current (GMR-TMR head, hard-disk, MRAM paměti, race track memory, spin oscillators).
8. Spin-Hall effect. Inverzní spin-Hall effect. Spinová calorimetry. Generation of spin current by temperature gradient.
9. Spin current in metals. Materials for spintronics. Relation between spin polarization and Fermi level. Spin relaxation. Half-metals, half-metallic Heusler compounds.
10. Spin current in semiconductors and organic materials. Rashba effect. Relation between spin-polarized current and radiated light polarization.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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