Structural and magnetic properties of annealed FePt/Ag/FePt thin films

O. P. Pavlova, T. I. Verbitska, I. A. Vladymyrskyi, S. I. Sidorenko, G. L. Katona, D. Beke, G. Beddies, M. Albrecht, I. M. Makogon

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Layer stacks of FePt(15 nm)/Ag(x)/FePt(15 nm) with various Ag interlayer thicknesses (x = 0, 3, and 30 nm) were deposited at room temperature onto SiO2(100 nm)/Si(0 0 1) substrates. These films were post-annealed in a temperature range of 100 °C-900 °C for 30 s under high vacuum condition. The influence of the Ag interlayer on the L10(FePt) FCT phase formation and its related structural and magnetic properties were investigated. The onset of chemical ordering of FePt single layers is observed at annealing temperatures between 600 °C and 700 °C. Increasing the Ag interlayer thickness to 30 nm reduces the ordering temperature of the L10(FePt)FCT phase formation by about ∼100 °C. Higher annealing temperatures lead to a further increase in volume fraction of the ordered L10(FePt)FCT phase but also to the diffusion of Ag towards the free surface as probed by secondary neutral mass spectrometry. In addition, due to the limited solvability of Ag into the FePt phase, Ag is expected to be located at the grain boundaries. The increasing volume fraction of the L10(FePt)FCT phase is also reflected in the increasing coercivity of the films which reaches values of up to ∼19 kOe after annealing at 900 °C. Furthermore, in this case similar M-H hysteresis loop were recorded when the field is applied in the film plane and perpendicular to it. This isotropic behavior is in agreement with the coexistence of L10 ordered grains which are randomly oriented.

Original languageEnglish
Pages (from-to)100-104
Number of pages5
JournalApplied Surface Science
Volume266
DOIs
Publication statusPublished - Feb 1 2013

Fingerprint

Structural properties
Magnetic properties
Thin films
Annealing
Volume fraction
Temperature
Hysteresis loops
Coercive force
Mass spectrometry
Grain boundaries
Vacuum
Substrates

Keywords

  • Chemical ordering
  • L1 FePt
  • Magnetic coercivity
  • Secondary neutral mass spectrometry

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Pavlova, O. P., Verbitska, T. I., Vladymyrskyi, I. A., Sidorenko, S. I., Katona, G. L., Beke, D., ... Makogon, I. M. (2013). Structural and magnetic properties of annealed FePt/Ag/FePt thin films. Applied Surface Science, 266, 100-104. https://doi.org/10.1016/j.apsusc.2012.11.102

Structural and magnetic properties of annealed FePt/Ag/FePt thin films. / Pavlova, O. P.; Verbitska, T. I.; Vladymyrskyi, I. A.; Sidorenko, S. I.; Katona, G. L.; Beke, D.; Beddies, G.; Albrecht, M.; Makogon, I. M.

In: Applied Surface Science, Vol. 266, 01.02.2013, p. 100-104.

Research output: Contribution to journalArticle

Pavlova, OP, Verbitska, TI, Vladymyrskyi, IA, Sidorenko, SI, Katona, GL, Beke, D, Beddies, G, Albrecht, M & Makogon, IM 2013, 'Structural and magnetic properties of annealed FePt/Ag/FePt thin films', Applied Surface Science, vol. 266, pp. 100-104. https://doi.org/10.1016/j.apsusc.2012.11.102
Pavlova OP, Verbitska TI, Vladymyrskyi IA, Sidorenko SI, Katona GL, Beke D et al. Structural and magnetic properties of annealed FePt/Ag/FePt thin films. Applied Surface Science. 2013 Feb 1;266:100-104. https://doi.org/10.1016/j.apsusc.2012.11.102
Pavlova, O. P. ; Verbitska, T. I. ; Vladymyrskyi, I. A. ; Sidorenko, S. I. ; Katona, G. L. ; Beke, D. ; Beddies, G. ; Albrecht, M. ; Makogon, I. M. / Structural and magnetic properties of annealed FePt/Ag/FePt thin films. In: Applied Surface Science. 2013 ; Vol. 266. pp. 100-104.
@article{061957c1389a43ce8addf29321afaf4b,
title = "Structural and magnetic properties of annealed FePt/Ag/FePt thin films",
abstract = "Layer stacks of FePt(15 nm)/Ag(x)/FePt(15 nm) with various Ag interlayer thicknesses (x = 0, 3, and 30 nm) were deposited at room temperature onto SiO2(100 nm)/Si(0 0 1) substrates. These films were post-annealed in a temperature range of 100 °C-900 °C for 30 s under high vacuum condition. The influence of the Ag interlayer on the L10(FePt) FCT phase formation and its related structural and magnetic properties were investigated. The onset of chemical ordering of FePt single layers is observed at annealing temperatures between 600 °C and 700 °C. Increasing the Ag interlayer thickness to 30 nm reduces the ordering temperature of the L10(FePt)FCT phase formation by about ∼100 °C. Higher annealing temperatures lead to a further increase in volume fraction of the ordered L10(FePt)FCT phase but also to the diffusion of Ag towards the free surface as probed by secondary neutral mass spectrometry. In addition, due to the limited solvability of Ag into the FePt phase, Ag is expected to be located at the grain boundaries. The increasing volume fraction of the L10(FePt)FCT phase is also reflected in the increasing coercivity of the films which reaches values of up to ∼19 kOe after annealing at 900 °C. Furthermore, in this case similar M-H hysteresis loop were recorded when the field is applied in the film plane and perpendicular to it. This isotropic behavior is in agreement with the coexistence of L10 ordered grains which are randomly oriented.",
keywords = "Chemical ordering, L1 FePt, Magnetic coercivity, Secondary neutral mass spectrometry",
author = "Pavlova, {O. P.} and Verbitska, {T. I.} and Vladymyrskyi, {I. A.} and Sidorenko, {S. I.} and Katona, {G. L.} and D. Beke and G. Beddies and M. Albrecht and Makogon, {I. M.}",
year = "2013",
month = "2",
day = "1",
doi = "10.1016/j.apsusc.2012.11.102",
language = "English",
volume = "266",
pages = "100--104",
journal = "Applied Surface Science",
issn = "0169-4332",
publisher = "Elsevier",

}

TY - JOUR

T1 - Structural and magnetic properties of annealed FePt/Ag/FePt thin films

AU - Pavlova, O. P.

AU - Verbitska, T. I.

AU - Vladymyrskyi, I. A.

AU - Sidorenko, S. I.

AU - Katona, G. L.

AU - Beke, D.

AU - Beddies, G.

AU - Albrecht, M.

AU - Makogon, I. M.

PY - 2013/2/1

Y1 - 2013/2/1

N2 - Layer stacks of FePt(15 nm)/Ag(x)/FePt(15 nm) with various Ag interlayer thicknesses (x = 0, 3, and 30 nm) were deposited at room temperature onto SiO2(100 nm)/Si(0 0 1) substrates. These films were post-annealed in a temperature range of 100 °C-900 °C for 30 s under high vacuum condition. The influence of the Ag interlayer on the L10(FePt) FCT phase formation and its related structural and magnetic properties were investigated. The onset of chemical ordering of FePt single layers is observed at annealing temperatures between 600 °C and 700 °C. Increasing the Ag interlayer thickness to 30 nm reduces the ordering temperature of the L10(FePt)FCT phase formation by about ∼100 °C. Higher annealing temperatures lead to a further increase in volume fraction of the ordered L10(FePt)FCT phase but also to the diffusion of Ag towards the free surface as probed by secondary neutral mass spectrometry. In addition, due to the limited solvability of Ag into the FePt phase, Ag is expected to be located at the grain boundaries. The increasing volume fraction of the L10(FePt)FCT phase is also reflected in the increasing coercivity of the films which reaches values of up to ∼19 kOe after annealing at 900 °C. Furthermore, in this case similar M-H hysteresis loop were recorded when the field is applied in the film plane and perpendicular to it. This isotropic behavior is in agreement with the coexistence of L10 ordered grains which are randomly oriented.

AB - Layer stacks of FePt(15 nm)/Ag(x)/FePt(15 nm) with various Ag interlayer thicknesses (x = 0, 3, and 30 nm) were deposited at room temperature onto SiO2(100 nm)/Si(0 0 1) substrates. These films were post-annealed in a temperature range of 100 °C-900 °C for 30 s under high vacuum condition. The influence of the Ag interlayer on the L10(FePt) FCT phase formation and its related structural and magnetic properties were investigated. The onset of chemical ordering of FePt single layers is observed at annealing temperatures between 600 °C and 700 °C. Increasing the Ag interlayer thickness to 30 nm reduces the ordering temperature of the L10(FePt)FCT phase formation by about ∼100 °C. Higher annealing temperatures lead to a further increase in volume fraction of the ordered L10(FePt)FCT phase but also to the diffusion of Ag towards the free surface as probed by secondary neutral mass spectrometry. In addition, due to the limited solvability of Ag into the FePt phase, Ag is expected to be located at the grain boundaries. The increasing volume fraction of the L10(FePt)FCT phase is also reflected in the increasing coercivity of the films which reaches values of up to ∼19 kOe after annealing at 900 °C. Furthermore, in this case similar M-H hysteresis loop were recorded when the field is applied in the film plane and perpendicular to it. This isotropic behavior is in agreement with the coexistence of L10 ordered grains which are randomly oriented.

KW - Chemical ordering

KW - L1 FePt

KW - Magnetic coercivity

KW - Secondary neutral mass spectrometry

UR - http://www.scopus.com/inward/record.url?scp=84872819488&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872819488&partnerID=8YFLogxK

U2 - 10.1016/j.apsusc.2012.11.102

DO - 10.1016/j.apsusc.2012.11.102

M3 - Article

AN - SCOPUS:84872819488

VL - 266

SP - 100

EP - 104

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

ER -