Helina Seemen “Atomic layer deposition and microscopic analysis of magnetically and electrically polarizable thin solid films” | University of Tartu

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Contacts of UT units

Faculty of Arts and Humanities
Faculty phone: 
+372 737 5341
Faculty address: 
Jakobi 2, rooms 116–121, 51005 Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5341
    Faculty address: 
    Jakobi 2, rooms 116–121, 51005 Tartu
  • Institute of History and Archaeology
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    Faculty address: 
    Jakobi 2, 51005 Tartu
  • Institute of Estonian and General Linguistics
    Faculty phone: 
    +372 737 5221
    Faculty address: 
    Jakobi 2, 51005 Tartu
  • Institute of Philosophy and Semiotics
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    +372 737 5314
    Faculty address: 
    Jakobi 2, rooms 309–352, 51005 Tartu
  • Institute of Cultural Research
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    Faculty address: 
    Ülikooli 16, 51003 Tartu
  • School of Theology and Religious Studies
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    +372 737 5301
    Faculty address: 
    Ülikooli 18–310, 50090 Tartu
  • College of Foreign Languages and Cultures
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    J. Liivi 4, 50409, Tartu
  • Viljandi Culture Academy
    Faculty phone: 
    +372 435 5232
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    Posti 1, 71004 Viljandi
Faculty of Social Sciences
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Lossi 36, 51003 Tartu
  • Dean's Office
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    Faculty address: 
    Lossi 36, 51003 Tartu
  • Institute of Education
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    Salme 1a–29, 50103 Tartu
  • Johan Skytte Institute of Political Studies
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    Lossi 36–301, 51003 Tartu
  • School of Economics and Business Administration
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  • Institute of Psychology
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  • Institute of Biomedicine and Translational Medicine
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Faculty of Science and Technology
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  • Dean's Office
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    Faculty address: 
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  • Estonian Marine Institute
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  • Institute of Physics
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  • Institute of Chemistry
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  • Institute of Genomics
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  • Institute of Mathematics and Statistics
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  • Institute of Molecular and Cell Biology
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  • Tartu Observatory
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  • Institute of Technology
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    Nooruse 1, 50411 Tartu
  • Institute of Ecology and Earth Sciences
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    Vanemuise 46, 51003 Tartu
Institutions
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    Faculty address: 
    W. Struve 1, 50091 Tartu
  • Youth Academy
    Faculty phone: 
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    Faculty address: 
    Uppsala 10, 51003 Tartu
  • Museum
    Faculty phone: 
    +372 737 5674
    Faculty address: 
    Lossi 25, 51003 Tartu
  • University of Tartu Natural History Museum and Botanical Garden
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    +372 737 6076
    Faculty address: 
    Vanemuise 46, 51003 Tartu
Support Units
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    Ülikooli 18a, 51005 Tartu
  • Centre for Entrepreneurship and Innovation
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    Faculty address: 
    Narva mnt 18, 51009, Tartu
  • University Office in Tallinn
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    Faculty address: 
    Teatri väljak 3, 10143 Tallinn
  • Estates Office
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    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Finance Office
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    +372 737 5125
    Faculty address: 
    Jakobi 4, 51005 Tartu
  • Grant Office
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    Raekoja plats 9, 51004 Tartu
  • Information Technology Office
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  • Human Resources Office
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  • Marketing and Communication Office
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    Ülikooli 18, rooms 102, 104, 209, 210, 50090 Tartu
  • Office of Academic Affairs
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    +372 737 5620
    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • Procurement Office
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    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Rector's Strategy Office
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    +372 737 5600
    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • Student Council
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    Ülikooli 18b, 51005 Tartu
  • University of Tartu Press
    Faculty phone: 
    +372 737 5945
    Faculty address: 
    W. Struve 1, 50091 Tartu
Other Units
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  • Tartu Students’ Club
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  • Tartu University Hospital
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    L. Puusepa 1a, 50406 Tartu
  • University of Tartu Foundation
    Faculty phone: 
    +372 737 5852
    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • View all other units

Helina Seemen “Atomic layer deposition and microscopic analysis of magnetically and electrically polarizable thin solid films”

Date: 
26.08.2021 - 14:15
On 26 August at 14:15 Helina Seemen will defend her doctoral thesis “Atomic layer deposition and microscopic analysis of magnetically and electrically polarizable thin solid films” for obtaining the degree of Doctor of Philosophy (in Materials Science).
 
Supervisors:
Associate Professor Aile Tamm, University of Tartu
Professor Kaupo Kukli, University of Tartu
 
Opponents:
Professor Emeritus Jyrki Räisänen, University of Helsinki (Finland)
Senior Research Fellow Olga Volobujeva, Tallinn University of Technology
 
Summary
The constant development of technology has been possible thanks to the development of new materials and technological methods. However, there remains a continual demand for new novel materials or material combinations with new or improved functionalities for electronics and information technology development to continue. One such attractive type of material is thin solid film material with multiferroic properties. Such materials have both ferroelectric and ferromagnetic properties, i.e. they are polarized by external electric and magnetic fields and can maintain polarization even if they are not continuously subjected to an external electric or magnetic field. Multiferroic materials are also attractive because they could be used in new generation memory devices since electric and magnetic fields could be used to store and read data.
 
Therefore, novel material combinations that were expected to show magnetic and electric polarization under the influence of external field at room temperature were created and characterized in the Thesis. For this, potentially ferromagnetic and ferroelectric materials (mainly metal oxides) were combined into multilayer structures and mixed films using the atomic layer deposition method. The atomic layer deposition method was used to fabricate thin solid films because it is already widely used in the field of microelectronics and allows to deposit films with high quality and controlled thickness.
 
The results showed that, in addition to the material combinations, the properties of the materials expectedly depended on the phase composition and deposition recipe. The metastable phases of several metal oxides were successfully stabilized, which affected the magnetic and electrical properties of the deposited films. Most of the created materials showed ferromagnetic-like behaviour by demonstrating non-linear magnetization and hysteresis under the influence of an external magnetic field. Few materials behaved similarly to the ferroelectric material under the influence of an external electric field.
Organizer: 
Harry Alles
Location: 
W. Ostwaldi 1, aud B103
URL: 
https://dspace.ut.ee/handle/10062/72995
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