Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Rice U. lab surprised by ultraflat magnets: Researchers create atom-thick alloys with unanticipated magnetic properties

This is a high-angle annular dark-field image of pure rhenium diselenide. In the key at bottom right, rhenium atoms are blue and selenium atoms yellow.
CREDIT
Oak Ridge National Laboratory
This is a high-angle annular dark-field image of pure rhenium diselenide. In the key at bottom right, rhenium atoms are blue and selenium atoms yellow. CREDIT Oak Ridge National Laboratory

Abstract:
Substituting atoms in the process of making two-dimensional alloys not only allows them to be customized for applications but also can make them magnetic, according to Rice University scientists and their collaborators.

Rice U. lab surprised by ultraflat magnets: Researchers create atom-thick alloys with unanticipated magnetic properties

Houston, TX | Posted on October 13th, 2017

A new paper in Advanced Materials outlines how researchers at Rice, Oak Ridge National Laboratory, the University of Southern California (USC) and Kumamoto University in Japan used chemical vapor deposition (CVD) to make atom-thick sheets and, in the same step, tailor their properties by adding other elements through a process known as doping.

They discovered by surprise that they could also give the 2-D sheets magnetic properties.

The labs worked with transition metal dichalcogenides, alloys that combine a transition metal and chalcogen atoms into a single material. Transition metals are stable elements that fall in the middle of the periodic table. Chalcogens include sulfur, selenium and tellurium, also neighbors to each other in the table.

By adding a dopant element to the mix during CVD, the researchers showed it was possible to rearrange the atoms on the resulting 2-D crystal sheets. They demonstrated several different configurations and found they could replace some atoms outright with the dopant. These physical changes led to changes in the mechanical and electronic properties of the flat crystals, said co-author and Rice postdoctoral researcher Chandra Sekhar Tiwary.

The Rice lab of Pulickel Ajayan led the project to test theories by USC researchers who calculated that doping the materials would force a phase transition in the 2-D crystals. The Rice team confirmed the theory that adding rhenium in various amounts to molybdenum diselenide during growth would allow them to tailor its properties by changing its atomic structure. The magnetic signatures were a bonus.

"Usually, when you make a magnetic material, you start with magnetic elements like iron or cobalt," said graduate student and co-lead author Amey Apte. "Rhenium, in bulk, is not a magnetic material, but it turns out it is in certain combinations at the atomic scale. It worked fantastically in this case."

The researchers said the magnetic properties they discovered could make the 2-D alloys of interest to those who design spintronic devices.

###

Former Rice postdoctoral researcher Vidya Kochat is co-lead author of the paper. Co-authors are Rice graduate student Sandhya Susarla; postdoctoral researcher Jordan Hachtel and staff scientist Juan Carlos Idrobo of Oak Ridge; graduate student Hiroyuki Kumazoe of the University of Southern California and Kumamoto University; postdoctoral researcher Aravind Krishnamoorthy and professors Priya Vashishta, Rajiv Kalia and Aiichiro Nakano of the University of Southern California; and Fuyuki Shimojo of Kumamoto University. Ajayan is chair of Rice's Department of Materials Science and NanoEngineering, the Benjamin M. and Mary Greenwood Anderson Professor in Engineering and a professor of chemistry.

The Computational Materials Science Program funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, supported the research.

####

About Rice University
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation's top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,879 undergraduates and 2,861 graduate students, Rice's undergraduate student-to-faculty ratio is 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice is ranked No. 1 for quality of life and for lots of race/class interaction and No. 2 for happiest students by the Princeton Review. Rice is also rated as a best value among private universities by Kiplinger's Personal Finance. To read "What they're saying about Rice," go to http://tinyurl.com/RiceUniversityoverview

Follow Rice News and Media Relations via Twitter @RiceUNews

For more information, please click here

Contacts:
David Ruth

713-348-6327

Copyright © Rice University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Read the abstract at:

Ajayan Research Group:

Rice Department of Materials Science and NanoEngineering:

Related News Press

News and information

Arrowhead Pharmaceuticals Reports Inducement Grants under NASDAQ Marketplace Rule 5635(c)(4) June 22nd, 2019

Next-gen solar cells spin in new direction: Phosphorene shows efficiency promise June 21st, 2019

Researchers report new understanding of thermoelectric materials: Discovery leads to promising new materials for converting waste heat to power June 21st, 2019

Millions with neurological diseases could find new option in implantable neurostimulation devices June 21st, 2019

Arrowhead Pharmaceuticals Receives Orphan Drug Designation for ARO-APOC3 June 21st, 2019

2 Dimensional Materials

Millions with neurological diseases could find new option in implantable neurostimulation devices June 21st, 2019

Kanazawa University research: Opposite piezoresistant effects of rhenium disulfide in two principle directions June 13th, 2019

2D crystals conforming to 3D curves create strain for engineering quantum devices June 7th, 2019

UCI scientists create new class of two-dimensional materials: Fabrication could help unlock new quantum computing and energy technologies June 6th, 2019

Flexible generators turn movement into energy: Rice University's laser-induced graphene nanogenerators could power future wearables June 2nd, 2019

Laboratories

2D crystals conforming to 3D curves create strain for engineering quantum devices June 7th, 2019

Quantum information gets a boost from thin-film breakthrough: Method opens new path to all-optical quantum computers, other technologies May 31st, 2019

Govt.-Legislation/Regulation/Funding/Policy

Next-gen solar cells spin in new direction: Phosphorene shows efficiency promise June 21st, 2019

Ice lithography: opportunities and challenges in 3D nanofabrication June 21st, 2019

Arrowhead Pharmaceuticals Receives Orphan Drug Designation for ARO-APOC3 June 21st, 2019

Electron-behaving nanoparticles rock current understanding of matter: Discovery will lead to new methods for materials design June 20th, 2019

Possible Futures

'Nanoemulsion' gels offer new way to deliver drugs through the skin: Novel materials made with FDA-approved components could deliver large payloads of active ingredients June 21st, 2019

Next-gen solar cells spin in new direction: Phosphorene shows efficiency promise June 21st, 2019

Researchers report new understanding of thermoelectric materials: Discovery leads to promising new materials for converting waste heat to power June 21st, 2019

Millions with neurological diseases could find new option in implantable neurostimulation devices June 21st, 2019

Spintronics

Small currents for big gains in spintronics: A new low-power magnetic switching component could aid spintronic devices June 14th, 2019

Rice U. lab grows stable, ultrathin magnets: Rare iron oxide could be combined with 2D materials for electronic, spintronic devices May 24th, 2019

Let's not make big waves: A team of researchers generates ultra-short spin waves in an astoundingly simple material March 29th, 2019

Spintronics by 'straintronics': Switching superferromagnetism with electric-field induced strain February 15th, 2019

Chip Technology

New record: 3D-printed optical-electronic integration June 18th, 2019

Can break junction techniques still offer quantitative information at single-molecule level June 18th, 2019

Mysterious Majorana quasiparticle is now closer to being controlled for quantum computing: Princeton researchers detect a robust Majorana quasiparticle and show how it can be turned on and off June 14th, 2019

Small currents for big gains in spintronics: A new low-power magnetic switching component could aid spintronic devices June 14th, 2019

Discoveries

'Nanoemulsion' gels offer new way to deliver drugs through the skin: Novel materials made with FDA-approved components could deliver large payloads of active ingredients June 21st, 2019

Next-gen solar cells spin in new direction: Phosphorene shows efficiency promise June 21st, 2019

Ice lithography: opportunities and challenges in 3D nanofabrication June 21st, 2019

Researchers report new understanding of thermoelectric materials: Discovery leads to promising new materials for converting waste heat to power June 21st, 2019

Materials/Metamaterials

Next-gen solar cells spin in new direction: Phosphorene shows efficiency promise June 21st, 2019

Electron-behaving nanoparticles rock current understanding of matter: Discovery will lead to new methods for materials design June 20th, 2019

University of Konstanz researchers create uniform-shape polymer nanocrystals: Researchers from the University of Konstanz's CRC 1214 'Anisotropic Particles as Building Blocks: Tailoring Shape, Interactions and Structures' generate uniform-shape nanocrystals using direct polymeriz June 14th, 2019

Laser technique could unlock use of tough material for next-generation electronics: Researchers make graphene tunable, opening up its band gap to a record 2.1 electronvolts May 30th, 2019

Announcements

Arrowhead Pharmaceuticals Reports Inducement Grants under NASDAQ Marketplace Rule 5635(c)(4) June 22nd, 2019

Ice lithography: opportunities and challenges in 3D nanofabrication June 21st, 2019

Researchers report new understanding of thermoelectric materials: Discovery leads to promising new materials for converting waste heat to power June 21st, 2019

Millions with neurological diseases could find new option in implantable neurostimulation devices June 21st, 2019

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

'Nanoemulsion' gels offer new way to deliver drugs through the skin: Novel materials made with FDA-approved components could deliver large payloads of active ingredients June 21st, 2019

Next-gen solar cells spin in new direction: Phosphorene shows efficiency promise June 21st, 2019

Ice lithography: opportunities and challenges in 3D nanofabrication June 21st, 2019

Electron-behaving nanoparticles rock current understanding of matter: Discovery will lead to new methods for materials design June 20th, 2019

Research partnerships

Researchers report new understanding of thermoelectric materials: Discovery leads to promising new materials for converting waste heat to power June 21st, 2019

2D crystals conforming to 3D curves create strain for engineering quantum devices June 7th, 2019

Shaking hands with human or robot? Nanotubes make them alike as never before June 6th, 2019

Beyond 1 and 0: Engineers boost potential for creating successor to shrinking transistors May 30th, 2019

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project