516-0952/01 – Spintronics (SPI)

Gurantor departmentInstitute of PhysicsCredits10
Subject guarantorMgr. Jaroslav Hamrle, Ph.D.Subject version guarantorMgr. Jaroslav Hamrle, Ph.D.
Study levelpostgraduateRequirementChoice-compulsory
YearSemesterwinter + summer
Study languageCzech
Year of introduction2012/2013Year of cancellation2015/2016
Intended for the facultiesUSPIntended for study typesDoctoral
Instruction secured by
LoginNameTuitorTeacher giving lectures
HAM0016 Mgr. Jaroslav Hamrle, Ph.D.
Extent of instruction for forms of study
Form of studyWay of compl.Extent
Full-time Examination 20+0
Combined Examination 20+0

Subject aims expressed by acquired skills and competences

The subject is based on current state of quickly evolving field of spintronics, i.e. electronics employing electron's spin. The subject is covering most directions of today's spintronics. The subject starts with definition of spin-polarized current and spin accumulation. Then, generation of spin-polarized current in non-magnetic materials is discussed, using spin injection and spin-pumping. Furthermore, we discuss the most important magnetoresistive effects (AMR, GMR, TMR), as well as spin transfer. Then, we discuss prototypical examples of using those effects in lateral structures and industrial applications. Finally, a short introduction to spin-calorimetry and to materials used in spintronics is provided.

Teaching methods

Lectures
Individual consultations

Summary

1. Kvantový popis elektronu (vlnová funkce, princip neurčitosti, tunelování). Orbitální a spinový moment elektronu. Nekolineární magnetizace, Pauliho matice. 2. Elektron v pevné látce. Fermiho hladina, Fermi-Diracova distribuce. Difuzní a balistický transport elektronu v pevné látce. 3. Spinová akumulace a spinově polarizovaný proud. Injekce spinově polarizovaného proudu z ferromagnetických do dia/para-magnetických materiálů pomocí nábojového proudu. Valet-Fert teorie. Conduction mismatch. 4. Magnetoresistivní jevy. Anisotropní magnetoresistivita (AMR). Obrovská magneto-resistivita (giant magnetoresistance – GMR). Koherentní a nekoherentní spinové magnetoresistivní tunelování (tunnelling magnetoresistance TMR). 5. Generace spinového proudu pomocí spin-pumping. Základy dynamiky magnetizace (FMR resonance, Landau-Lifschitz rovnice) za přítomnosti spinově-polarizovaného proudu. Spinový moment neboli spin-transfer (působení spinově polarizovaného proudu na magnetizaci). Pohyb doménové a změna magnetizace stěny pomocí spinově-polarizovaného proudu. Spinové magnetické oscilátory (volné, vázané). 6. Laterální zařízení využívající spin-polarizovaného proudu. Lokální a nelokální spinová injekce. Tří-dimenzionální tok spinově polarizovaného proudu. 7. Principy zařízení používající spinově-polarizovaný proud (GMR-TMR head, hard-disk, MRAM paměti, race track memory, spinové oscilátory). 8. Spin-Hallův jev. Inverzní spin-Hallův jev. Spinová kalorimetrie. Generace spinového proudu gradientem teploty. 9. Spinový proud v kovech. Materiály pro spintroniku. Vztah mezi spinovou polarizací proudu a Fermiho hladinou. Spinová relaxace. Polokovy, polokovové Heuslerovi slitiny. 10. Spinový proud v polovodičích a organických materiálech. Rashba efekt. Vztah spinově-polarizovaného proudu a detekovaného/radiovaného světla.

Compulsory literature:

1. Nanomagnetism and Spintronics, Teruya Shinjo (Editor), Elsevier (2009). 2. Concepts in spin-electronics, S. Maekawa, Oxford University Press (2006). 3. F.J. Jedema, PhD. thesis, University of Groningen, The Netherlands (2002).

Recommended literature:

1. T. Valet and A. Fert, Theory of the perpendicular magnetoresistance in magnetic multilayers, Phys. Rev. B 48, 7099 (1993). 2. T. Yang, T. Kimura and Y. Otani, Giant spin-accumulation signal and pure spin-current-induced reversible magnetization switching, Nature Physics 4, 851 (2008).

Way of continuous check of knowledge in the course of semester

E-learning

Další požadavky na studenta

Systematic individual study required.

Prerequisities

Subject has no prerequisities.

Co-requisities

Subject has no co-requisities.

Subject syllabus:

The lesson is based on current state of quickly evolving field of spintronics, meaning electronics based on electron's spin. The subject is covering most of important directions of current spintronics. It starts with definition of spin-polarized current and spin accumulation. Then, the idea of generation and detection of spin-polarized current in non-magnetic materials is discussed (by spin injection or by spin pumping). Furthermore, the magnetoresistive effects (AMR, GMR, TMR) are discussed, as well as spin moment (spin transfer). It continues by several prototypical examples of those effects in lateral systems and industrial applications. Finally, short introduction to spin-calorimetry and to materials used in spintronics is provided.

Conditions for subject completion

Full-time form (validity from: 2013/2014 Winter semester, validity until: 2015/2016 Summer semester)
Task nameType of taskMax. number of points
(act. for subtasks)
Min. number of points
Examination Examination  
Mandatory attendence parzicipation:

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Occurrence in study plans

Academic yearProgrammeField of studySpec.FormStudy language Tut. centreYearWSType of duty
2015/2016 (P3942) Nanotechnology (3942V001) Nanotechnology P Czech Ostrava Choice-compulsory study plan
2015/2016 (P3942) Nanotechnology (3942V001) Nanotechnology K Czech Ostrava Choice-compulsory study plan
2014/2015 (P3942) Nanotechnology (3942V001) Nanotechnology P Czech Ostrava Choice-compulsory study plan
2014/2015 (P3942) Nanotechnology P Czech Ostrava Choice-compulsory study plan
2014/2015 (P3942) Nanotechnology (3942V001) Nanotechnology K Czech Ostrava Choice-compulsory study plan
2013/2014 (P3942) Nanotechnology (3942V001) Nanotechnology P Czech Ostrava Choice-compulsory study plan
2013/2014 (P3942) Nanotechnology (3942V001) Nanotechnology K Czech Ostrava Choice-compulsory study plan
2012/2013 (P3942) Nanotechnology (3942V001) Nanotechnology P Czech Ostrava Choice-compulsory study plan
2012/2013 (P3942) Nanotechnology (3942V001) Nanotechnology K Czech Ostrava Choice-compulsory study plan

Occurrence in special blocks

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