"Kaappa, Sami" - Selaus tekijän mukaan TUNICRIS-julkaisut

Viitteet 1-5 / 5

    • Barkhausen noise from formation of 360° domain walls in disordered permalloy thin films 

      Kaappa, Sami; Laurson, Lasse (04 / 2023)
      article
      Barkhausen noise in disordered ferromagnets is typically understood to originate primarily from jerky field-driven motion of domain walls. We study the magnetization reversal process in disordered permalloy thin films using ...

    • GPAW : An open Python package for electronic structure calculations 

      Mortensen, Jens Jørgen; Larsen, Ask Hjorth; Kuisma, Mikael; Ivanov, Aleksei V.; Taghizadeh, Alireza; Peterson, Andrew; Haldar, Anubhab; Dohn, Asmus Ougaard; Schäfer, Christian; Jónsson, Elvar Örn; Hermes, Eric D.; Nilsson, Fredrik Andreas; Kastlunger, Georg; Levi, Gianluca; Jónsson, Hannes; Häkkinen, Hannu; Fojt, Jakub; Kangsabanik, Jiban; Sødequist, Joachim; Lehtomäki, Jouko; Heske, Julian; Enkovaara, Jussi; Winther, Kirsten Trøstrup; Dulak, Marcin; Melander, Marko M.; Ovesen, Martin; Louhivuori, Martti; Walter, Michael; Gjerding, Morten; Lopez-Acevedo, Olga; Erhart, Paul; Warmbier, Robert; Würdemann, Rolf; Kaappa, Sami; Latini, Simone; Boland, Tara Maria; Bligaard, Thomas; Skovhus, Thorbjørn; Susi, Toma; Maxson, Tristan; Rossi, Tuomas; Chen, Xi; Schmerwitz, Yorick Leonard A.; Schiøtz, Jakob; Olsen, Thomas; Jacobsen, Karsten Wedel; Thygesen, Kristian Sommer (07.03.2024)
      article
      We review the GPAW open-source Python package for electronic structure calculations. GPAW is based on the projector-augmented wave method and can solve the self-consistent density functional theory (DFT) equations using ...

    • Machine-learning-enabled optimization of atomic structures using atoms with fractional existence 

      Larsen, Casper; Kaappa, Sami; Vishart, Andreas Lynge; Bligaard, Thomas; Jacobsen, Karsten Wedel (06 / 2023)
      article
      We introduce a method for global optimization of the structure of atomic systems that uses additional atoms with fractional existence. The method allows for movement of atoms over long distances bypassing energy barriers ...

    • Magnetic domain wall dynamics studied by in-situ lorentz microscopy with aid of custom-made Hall-effect sensor holder 

      Honkanen, Mari; Lukinmaa, Henri; Kaappa, Sami; Santa-aho, Suvi; Kajan, Jaakko; Savolainen, Samuli; Azzari, Lucio; Laurson, Lasse; Palosaari, Mikko; Vippola, Minnamari (26.04.2024)
      article
      We built a custom-made holder with a Hall-effect sensor to measure the single point magnetic flux density inside a transmission electron microscope (TEM, JEM-F200, JEOL). The measurement point is at the same place as the ...

    • Multi-instrumental approach to domain walls and their movement in ferromagnetic steels – Origin of Barkhausen noise studied by microscopy techniques 

      Santa-aho, Suvi; Honkanen, Mari; Kaappa, Sami; Azzari, Lucio; Saren, Andrey; Ullakko, Kari; Laurson, Lasse; Vippola, Minnamari (10 / 2023)
      article
      Two steels, ferrite and ferrite-pearlite were thoroughly characterized by a multi-instrumental microscopy techniques to get detailed information about their microstructure and magnetic structure. Microstructural features ...