Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane
Daria Tishkevich,
Alla Vorobjova,
Dmitry Shimanovich,
Egor Kaniukov,
Artem Kozlovskiy,
Maxim Zdorovets,
Denis Vinnik,
Andrei Turutin,
Ilya Kubasov,
Alexander Kislyuk,
Mengge Dong,
M. I. Sayyed,
Tatiana Zubar,
Alex Trukhanov
Affiliations
Daria Tishkevich
Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus
Alla Vorobjova
Department of Micro and Nanoelectronics, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Dmitry Shimanovich
Department of Micro and Nanoelectronics, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Egor Kaniukov
Department of Technology of Electronic Materials, Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology, «MISIS», 119049 Moscow, Russia
Laboratory of Single Crystal Growth, South Ural State University, 454080 Chelyabinsk, Russia
Andrei Turutin
Department of Technology of Electronic Materials, Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology, «MISIS», 119049 Moscow, Russia
Ilya Kubasov
Department of Technology of Electronic Materials, Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology, «MISIS», 119049 Moscow, Russia
Alexander Kislyuk
Department of Technology of Electronic Materials, Department of Materials Science of Semiconductors and Dielectrics, National University of Science and Technology, «MISIS», 119049 Moscow, Russia
Mengge Dong
Department of Resource and Environment, Northeastern University, Shenyang 110819, China
M. I. Sayyed
Department of Physics, Faculty of Science, Isra University, Amman 11622, Jordan
Tatiana Zubar
Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus
Alex Trukhanov
Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus
High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized.
