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Title: Ledge-type Co/L1{sub 0}-FePt exchange-coupled composites

Abstract

FePt-based exchange-coupled composites consisting of a magnetically hard L1{sub 0}-FePt phase exchange-coupled with a soft ferromagnetic material are promising candidates for future ultra-high density (>1 Tbit/in{sup 2}) perpendicular magnetic recording media, also being of interest for other applications including spin torque oscillators and micro-electro-mechanical systems, among others. In this paper, the effect of the thickness of a soft Co layer (3 < th{sub Co} < 20 nm) on the magnetic behavior of ledge-type fcc(100)-Co/L1{sub 0}(001)-FePt composites deposited on an MgO (100) substrate is systematically studied by combining morpho-structural analyses and angular magnetization measurements. Starting from a film consisting of isolated L1{sub 0}(001)–FePt islands, the ledge-type structure was obtained by depositing a Co layer that either covered the FePt islands or filled-up the inter-island region, gradually forming a continuous layer with increasing Co thickness. A perpendicular anisotropy was maintained up to th{sub Co} ∼ 9.5 nm and a significant reduction in the coercivity (about 50% for th{sub Co} ∼ 3 nm) with the increase in th{sub Co} was observed, indicating that, by coupling hard FePt and soft Co phases in a ledge-type configuration, the writability can be greatly improved. Recoil loops' measurements confirmed the exchange-coupled behavior, reinforcing a potential interest in these systems formore » future magnetic recording media.« less

Authors:
; ;  [1]; ;  [2];  [3]; ; ; ; ;  [4]
  1. Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens 15310 (Greece)
  2. Department of Physics, University of Delaware, Newark, Delaware 19716 (United States)
  3. SIMAU, Università Politecnica delle Marche, via Brecce Bianche, Ancona (Italy)
  4. ISM-CNR, Area della Ricerca RM1, Via Salaria Km 29,300, P.B. 10-00015, Monterotondo Scalo, Roma (Italy)
Publication Date:
OSTI Identifier:
22596809
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 23; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COERCIVE FORCE; DENSITY; DEPOSITS; FCC LATTICES; FERROMAGNETIC MATERIALS; FILMS; IRON COMPOUNDS; LAYERS; MAGNESIUM OXIDES; MAGNETIZATION; OSCILLATORS; PLATINUM COMPOUNDS; RECOILS; SPIN; SUBSTRATES; THICKNESS; TORQUE

Citation Formats

Speliotis, Th., Giannopoulos, G., Niarchos, D., Li, W. F., Hadjipanayis, G., Barucca, G., Agostinelli, E., Laureti, S., Peddis, D., Testa, A. M., and Varvaro, G., E-mail: gaspare.varvaro@ism.cnr.it. Ledge-type Co/L1{sub 0}-FePt exchange-coupled composites. United States: N. p., 2016. Web. doi:10.1063/1.4953766.
Speliotis, Th., Giannopoulos, G., Niarchos, D., Li, W. F., Hadjipanayis, G., Barucca, G., Agostinelli, E., Laureti, S., Peddis, D., Testa, A. M., & Varvaro, G., E-mail: gaspare.varvaro@ism.cnr.it. Ledge-type Co/L1{sub 0}-FePt exchange-coupled composites. United States. doi:10.1063/1.4953766.
Speliotis, Th., Giannopoulos, G., Niarchos, D., Li, W. F., Hadjipanayis, G., Barucca, G., Agostinelli, E., Laureti, S., Peddis, D., Testa, A. M., and Varvaro, G., E-mail: gaspare.varvaro@ism.cnr.it. Tue . "Ledge-type Co/L1{sub 0}-FePt exchange-coupled composites". United States. doi:10.1063/1.4953766.
@article{osti_22596809,
title = {Ledge-type Co/L1{sub 0}-FePt exchange-coupled composites},
author = {Speliotis, Th. and Giannopoulos, G. and Niarchos, D. and Li, W. F. and Hadjipanayis, G. and Barucca, G. and Agostinelli, E. and Laureti, S. and Peddis, D. and Testa, A. M. and Varvaro, G., E-mail: gaspare.varvaro@ism.cnr.it},
abstractNote = {FePt-based exchange-coupled composites consisting of a magnetically hard L1{sub 0}-FePt phase exchange-coupled with a soft ferromagnetic material are promising candidates for future ultra-high density (>1 Tbit/in{sup 2}) perpendicular magnetic recording media, also being of interest for other applications including spin torque oscillators and micro-electro-mechanical systems, among others. In this paper, the effect of the thickness of a soft Co layer (3 < th{sub Co} < 20 nm) on the magnetic behavior of ledge-type fcc(100)-Co/L1{sub 0}(001)-FePt composites deposited on an MgO (100) substrate is systematically studied by combining morpho-structural analyses and angular magnetization measurements. Starting from a film consisting of isolated L1{sub 0}(001)–FePt islands, the ledge-type structure was obtained by depositing a Co layer that either covered the FePt islands or filled-up the inter-island region, gradually forming a continuous layer with increasing Co thickness. A perpendicular anisotropy was maintained up to th{sub Co} ∼ 9.5 nm and a significant reduction in the coercivity (about 50% for th{sub Co} ∼ 3 nm) with the increase in th{sub Co} was observed, indicating that, by coupling hard FePt and soft Co phases in a ledge-type configuration, the writability can be greatly improved. Recoil loops' measurements confirmed the exchange-coupled behavior, reinforcing a potential interest in these systems for future magnetic recording media.},
doi = {10.1063/1.4953766},
journal = {Journal of Applied Physics},
number = 23,
volume = 119,
place = {United States},
year = {Tue Jun 21 00:00:00 EDT 2016},
month = {Tue Jun 21 00:00:00 EDT 2016}
}