The relationship between microstructure and magnetic properties in high-energy permanent magnets characterized by polytwinned structures. Final report

PDF Version Also Available for Download.

Description

This research program was initially conceived to investigate the structure-property relationships in a unique family of permanent magnet alloys which exhibit a polysynthetically twinned microstructure and high magnetocrystalline anisotropies. The polytwinned structures derive from the A1 (cubic) {r_arrow} L1{sub 0} (tetragonal) atomic ordering wherein the strain energy attendant to the transformation is relaxed by the formation of twin-related lamellae through mutual arrangement of crystallographic variants of the c-axis. This behavior is characteristic of the Co-Pt. Fe-Pt and Fe-Pd alloy systems in the vicinity of the equiatomic composition which exhibit a high, uniaxial crystal anisotropy (K{sub 1} {approximately} 10{sup 7}--10{sup 8} ... continued below

Physical Description

7 p.

Creation Information

Soffa, W.A. September 1, 1998.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Author

Sponsor

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

This research program was initially conceived to investigate the structure-property relationships in a unique family of permanent magnet alloys which exhibit a polysynthetically twinned microstructure and high magnetocrystalline anisotropies. The polytwinned structures derive from the A1 (cubic) {r_arrow} L1{sub 0} (tetragonal) atomic ordering wherein the strain energy attendant to the transformation is relaxed by the formation of twin-related lamellae through mutual arrangement of crystallographic variants of the c-axis. This behavior is characteristic of the Co-Pt. Fe-Pt and Fe-Pd alloy systems in the vicinity of the equiatomic composition which exhibit a high, uniaxial crystal anisotropy (K{sub 1} {approximately} 10{sup 7}--10{sup 8} ergs/cm{sup 3}) with an easy c-axis. The twinned microstructure results in a magnetically modulated state since the easy axis of magnetization varies quasi-periodically on a scale {approx} 10 to 100 nm. The transformation twins are conjugated along the {l_brace}110{r_brace} planes of the fcc parent phase. In this research program, the microstructural and magnetic studies have focused on the FePd polytwinned ferromagnets. In the latter stages of the program, the work on the L1{sub 0} FePd alloys was extended to investigated of the relationship between the structure and properties of nanostructured FePd ferromagnets, as well as preliminary studies of the deformation behavior of the L1{sub 0} FePd intermetallic phase.

Physical Description

7 p.

Notes

OSTI as DE99000724

Medium: P; Size: 7 p.

Source

  • Other Information: PBD: Sep 1998

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE99000724
  • Report No.: DOE/ER/45390--T1
  • Grant Number: FG02-89ER45390
  • DOI: 10.2172/674978 | External Link
  • Office of Scientific & Technical Information Report Number: 674978
  • Archival Resource Key: ark:/67531/metadc703706

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • September 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • April 13, 2017, 12:49 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 7

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Soffa, W.A. The relationship between microstructure and magnetic properties in high-energy permanent magnets characterized by polytwinned structures. Final report, report, September 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc703706/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.