Magnetocaloric effect in nickel and iron nanowires with a domain wall

Abstract

The magnetocaloric effect (MCE) in cylindrical nickel and iron nanowires containing a domain wall (DW) was investigated. A negative MCE was found out in these systems in a weak magnetic field, caused by thermal motion of the DW. It is shown that this phenomenon enhances with reduction of the magnetization of nanowires. For example, a decrease in magnetization by 50% in nickel or by 41.2% in iron nanowire leads to increment of their critical diameters (in the same magnetic field) by 48 and 27.5%, respectively. It is found that negative MCE makes it possible to change the initial temperature of 103–104 compacted nanowires by  ~ 1 K. This result is of practical interest in the context of developing technologies based on the thermodynamic properties of nickel and iron nanowires with DW.

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Funding

The work was also supported by the National Academy of Sciences of Ukraine within the budget program KΠKBK 6541230 “Support for the development of priority areas of scientific research”. The work was also supported by National Academy of Sciences of Ukraine within the budget science theme “Physical properties of self-organization and special features of the macroscopic quantum phenomena in low-dimensional systems of organic semiconductors and transition metals”.

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ABS and MYB took part in the formulation of problems and ways to solve it. MYB participated in the task and designed according to the requirements of article publication. Both authors read and approved the final manuscript.

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Correspondence to M. Yu. Barabash.

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Shevchenko, A.B., Barabash, M.Y. Magnetocaloric effect in nickel and iron nanowires with a domain wall. Appl Nanosci (2021). https://doi.org/10.1007/s13204-020-01649-8

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Keywords

  • Nickel (iron) nanowires
  • Domain wall
  • Entropy
  • Magnetocaloric effect