Spintronics interfaces subject of new NIST and Argonne study

October 24, 2011 — A highly engineered lanthanum and strontium compound material could form the basis of spintronics devices, report Argonne National Laboratory (ANL) and the National Institute of Standards and Technology (NIST) researchers.

ANL team members engineered the highly ordered magnetic oxide compound of lanthanum and strontium. ANL used atomic layer deposition to organize the lattice in layers of just strontium and just lanthanum. In randomly created compounds, stronger magnetic properties are found where extra lanthanum atoms are added to the lattice. The researchers’ virtually perfect sample of the material allowed them to study fundamental characteristics, said Brian Kirby, a physicist at the NIST Center for Neutron Research (NCNR).

Figure. Manganite oxide lattices (blue) doped with lanthanum (red) and strontium (green) have potential for use in spintronic memory devices, but their usual disorderly arrangement (left) makes it difficult to explore their properties. The ANL/NIST team’s use of a novel orderly lattice (right) allowed them to measure some of the material’s fundamental characteristics. SOURCE: Argonne National Laboratory.

The NIST team members used the NCNR’s polarized neutron reflectometer to analyze the magnetic properties within this oxide lattice versus those of a random compound. The influence of electrons near the additional lanthanum layers was spread out across three magnetic layers in either direction, but fell off sharply further away than that. Tiffany Santos, lead scientist on the study from ANL, says that the measurement will be important for the emerging field of oxide spintronics, as it reveals a fundamental size unit for electronic and magnetic effects in memory devices made from the material.

Also read: Brookhaven studies FET’s superconductor transition

Referring to use for memory chips, Kirby says that electrons will need to be physically close enough to influence each other to share spin information. The precisely constructed compound showed the researchers "how big that range of influence is," Kirby explained.

Results were published in Physical Review Letters: T. S. Santos, B. J. Kirby, S. Kumar, S. J. May, J. A. Borchers, B. B. Maranville, J. Zarestky, S. G. E. te Velthuis, J. van den Brink and A. Bhattacharya. Delta doping of ferromagnetism in antiferromagnetic manganite superlattices. Physical Review Letters, Week ending Oct. 14, 2011, 107, 167202 (2011), DOI: 10.1103/PhysRevLett.107.167202.

The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce. Learn more at www.nist.gov.


Easily post a comment below using your Linkedin, Twitter, Google or Facebook account. Comments won't automatically be posted to your social media accounts unless you select to share.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>



3D-Micromac launches the second generation of its high-performance microcell OTF laser systems
04/17/2017The high-performance production solution for Laser Contact Opening (LCO) of PERC solar cells achieves a th...
ULVAC launches NA-1500 dry etching system for 600mm advanced packaging systems
03/24/2017ULVAC, Inc. is pleased to announce the NA-1500 dry etching system for 600mm advanced packaging substrates, providing for u...
Astronics Test Systems announces new PXIe test instruments
01/24/2017Astronics Corporation, through its wholly-owned subsidiary Astronics Test Systems, introduced two new test instruments today. ...