Publication result detail

Effect of Gd addition on the structural and magnetic properties of L1(0)-FePt alloy thin films

SCHMIDT, N.; ABDULAZHANOV, S.; MICHALIČKA, J.; HINTERMAYR, J.; MAN, O.; CAHA, O.; URBÁNEK, M.; ALBRECHT, M.

Original Title

Effect of Gd addition on the structural and magnetic properties of L1(0)-FePt alloy thin films

English Title

Effect of Gd addition on the structural and magnetic properties of L1(0)-FePt alloy thin films

Type

WoS Article

Original Abstract

The impact of Gd addition on the structural and magnetic properties of L1(0)-FePt alloy thin films, which were sputter-deposited on MgO (001) substrates at 800 degrees C, was investigated. A rapid deterioration of L1(0) chemical ordering along with a strong amorphization effect is observed with addition of Gd. At more than 20 at. % Gd, additional crystalline phases occur. Due to the diminishing L1(0) chemical order, the perpendicular magnetic anisotropy (PMA) gets strongly reduced from about 3 down to 1 MJ/m(3) with addition of 14 at. % Gd. For higher Gd concentrations, the easy axis of magnetization turns fully in-plane due to dominating magnetic shape anisotropy. Furthermore, the saturation magnetization gets reduced with Gd addition due to the antiferromagnetic coupling between the Fe and Gd magnetic moments. Also, the Curie temperature can be lowered. Interestingly, with addition of Gd, a change in film morphology takes place, changing from an isolated island structure to a more continuous film morphology, which is of particular interest for samples with low Gd concentration as these films exhibit still strong PMA but rather low coercive fields. Published under an exclusive license by AIP Publishing.

English abstract

The impact of Gd addition on the structural and magnetic properties of L1(0)-FePt alloy thin films, which were sputter-deposited on MgO (001) substrates at 800 degrees C, was investigated. A rapid deterioration of L1(0) chemical ordering along with a strong amorphization effect is observed with addition of Gd. At more than 20 at. % Gd, additional crystalline phases occur. Due to the diminishing L1(0) chemical order, the perpendicular magnetic anisotropy (PMA) gets strongly reduced from about 3 down to 1 MJ/m(3) with addition of 14 at. % Gd. For higher Gd concentrations, the easy axis of magnetization turns fully in-plane due to dominating magnetic shape anisotropy. Furthermore, the saturation magnetization gets reduced with Gd addition due to the antiferromagnetic coupling between the Fe and Gd magnetic moments. Also, the Curie temperature can be lowered. Interestingly, with addition of Gd, a change in film morphology takes place, changing from an isolated island structure to a more continuous film morphology, which is of particular interest for samples with low Gd concentration as these films exhibit still strong PMA but rather low coercive fields. Published under an exclusive license by AIP Publishing.

Keywords

FEPT FILMS; MGO; ANISOTROPY

Key words in English

FEPT FILMS; MGO; ANISOTROPY

Authors

SCHMIDT, N.; ABDULAZHANOV, S.; MICHALIČKA, J.; HINTERMAYR, J.; MAN, O.; CAHA, O.; URBÁNEK, M.; ALBRECHT, M.

RIV year

2023

Released

07.12.2022

Publisher

AIP Publishing

Location

MELVILLE

ISBN

1089-7550

Periodical

JOURNAL OF APPLIED PHYSICS

Volume

132

Number

21

State

United States of America

Pages count

9

URL

https://aip.scitation.org/doi/10.1063/5.0124652

BibTex

@article{BUT182383,
  author="Natallia Y. {Schmidt} and Sukhrob {Abdulazhanov} and Jan {Michalička} and Julian {Hintermayr} and Ondřej {Man} and Ondřej {Caha} and Michal {Urbánek} and Manfred {Albrecht}",
  title="Effect of Gd addition on the structural and magnetic properties of L1(0)-FePt alloy thin films",
  journal="JOURNAL OF APPLIED PHYSICS",
  year="2022",
  volume="132",
  number="21",
  pages="9",
  doi="10.1063/5.0124652",
  issn="0021-8979",
  url="https://aip.scitation.org/doi/10.1063/5.0124652"
}