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Title: Relating surface roughness and magnetic domain structure to giant magneto-impedance of Co-rich melt-extracted microwires

Understanding the relationship between the surface conditions and giant magneto-impedance (GMI) in Co-rich melt-extracted microwires is key to optimizing their magnetic responses for magnetic sensor applications. The surface magnetic domain structure (SMDS) parameters of ~45 μm diameter Co 69.25Fe 4.25Si 13B 13.5-xZr x (x = 0, 1, 2, 3) microwires, including the magnetic domain period (d) and surface roughness (Rq) as extracted from the magnetic force microscopy (MFM) images, have been correlated with GMI in the range 1–1000 MHz. It was found that substitution of B with 1 at. % Zr increased d of the base alloy from 729 to 740 nm while retaining Rq from ~1 nm to ~3 nm. A tremendous impact on the GMI ratio was found, increasing the ratio from ~360% to ~490% at an operating frequency of 40 MHz. Further substitution with Zr decreased the high frequency GMI ratio, which can be understood by the significant increase in surface roughness evident by force microscopy. Lastly, this study demonstrates the application of the domain period and surface roughness found by force microscopy to the interpretation of the GMI in Co-rich microwires.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [1] ;  [5] ;  [1] ;  [2] ;  [2]
  1. Harbin Inst. of Technology (China). School of Materials Science and Engineering
  2. Univ. of South Florida, Tampa, FL (United States). Dept. of Physics
  3. Harbin Inst. of Technology (China). School of Materials Science and Engineering; Univ. of South Florida, Tampa, FL (United States). Dept. of Physics
  4. Inner Mongolia Univ., of Technology, Hohhot (China). School of Materials Science and Engineering
  5. Harbin Inst. of Technology (China). School of Materials Science and Engineering; Harbin Univ. of Science and Technology, Harbin (China). School of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
FG02-07ER46438; 51671071; 51401111; 51561026
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of South Florida, Tampa, FL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1362035