Skip to main content
SpringerLink
Log in

Focused ion beam structured Co/Pt multilayers for field-coupled magnetic computing

  • Published:
MRS Online Proceedings Library Aims and scope

Abstract

We fabricated and patterned magnetic dots from Co/Pt multilayers and optimized the structure for strong inter-dot magnetic coupling. SQUID measurements show strong perpendicular anisotropy with characteristic sheared hysteresis loops. The films are fabricated by RF-magnetron sputtering and then patterned with a 50 keV Ga+ focused ion beam (FIB) tool. This keeps surface roughness low and feature sizes in the hundred-nanometer-regime are achievable by a single processing step. Simulations with the well established SRIM (Stopping and Range of Ions in Matter) code give an estimation of the beam diameter and help to estimate the FIB patterning potential. In order to show antiferromagnetic ordering large 48×48 dot arrays of (200×200) nm2 single domain dots were fabricated. The samples were demagnetized and scanned by magnetic force microscopy (MFM) in the remanent state. The demagnetized checkerboard patterns show no frustration over hundreds of dots. The fabricated single domain magnets are prospective building blocks for field-coupled magnetic logic devices.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. A. Imre, G. Csaba, L. Ji, A. Orlov, G.H. Bernstein, and W. Porod : Majority Logic Gate for Magnetic Quantum-Dot Cellular Automata. SCIENCE, 311:205–208, January 2005.

    Article  Google Scholar 

  2. G. Csaba, A. Imre, G. H. Bernstein, W. Porod, and V. Metlushko : Nanocomputing by Field-Coupled Nanomagnets. IEEE Transactions on Nanotechnology, 1(4):209–213, 2002.

    Article  Google Scholar 

  3. P. F. Carcia, M. Reilly, Z. G. Li, and H. W. van Kesteren : Ar-Sputtered Pt/Co Multilayers with Large Anisotropy Energy and Coercivity. IEEE Transactions on Magnetics, 30(6):4395–4397, November 1994.

    Article  CAS  Google Scholar 

  4. T. Aign, P. Meyer, S. Lemerle, J. P. Jamet, J. Ferre, V. Mathet, C. Chappert, J. Gierak, C. Vieu, F. Rousseaux, H. Launois, and H. Bernas : Magnetization Reversal in Arrays of Perpendicularly Magnetized Ultrathin Dots Coupled by Dipolar Interaction. Physical Review Letters, 81:5656–5659, 1998.

    Article  CAS  Google Scholar 

  5. A. Thiaville, Belliard L., Majer D., E. Zeldov, and J. Miltat : Measurement of the stray field emanating from magnetic force microscope tips by Hall effect microsensors. Journal of Applied Physics, 82(7):3182–3191, October 1997.

    Article  CAS  Google Scholar 

  6. W. B. Zeper, H. W. van Kesteren, B. A. J. Jacobs, J. H. M. Spruit, and P. F. Carcia : Hysteresis, microstructure, and magneto-optical recording in Co/Pt and Co/Pd multilayers. Journal of Applied Physics, 70(4):2264–2271, August 1991.

    Article  CAS  Google Scholar 

  7. M. Becherer, G. Csaba, W. Porod, R. Emling, P. Lugli, D. Schmitt-Landsiedel : Magnetic Ordering of Focused-Ion-Beam Structured Cobalt-Platinum Dots for Field-Coupled Computing To be published in IEEE Transactions on Nanotechnology.

  8. http://math.nist.gov/oommf/

  9. J. F. Ziegler, J. P. Biersack, U. Littmark : The Stopping and Range of Ions in Solids. Vol.1 of series: Stopping and Ranges of Ions in Matter. Pergamon Press, New York, 1984.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Institute for Technical Electronics, Technical University Munich, Theresienstrasse 90, 80333, Munich, Germany

    Markus Becherer, Rainer Emling & Doris Schmitt-Landsiedel

  2. Institute for Nanoelectronics, Technical University Munich, Theresienstrasse 90, 80333, Munich, Germany

    Gyorgy Csaba & Paolo Lugli

  3. Department of Electrical Engineering, Center for Nanoscience and Technology, University of Notre Dame, 203 Cushing Hall, 46556, Notre Dame, IN, USA

    Lili Ji & Wolfgang Porod

Authors
  1. Markus Becherer
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Gyorgy Csaba
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Rainer Emling
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Lili Ji
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Wolfgang Porod
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Paolo Lugli
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. Doris Schmitt-Landsiedel
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Becherer, M., Csaba, G., Emling, R. et al. Focused ion beam structured Co/Pt multilayers for field-coupled magnetic computing. MRS Online Proceedings Library 998, 607 (2007). https://doi.org/10.1557/PROC-998-J06-07

Download citation

  • Published:

  • DOI: https://doi.org/10.1557/PROC-998-J06-07

Search

Navigation