A phase analysis method for ferromagnetic resonance characterization of magnetic nanowires

Yali Zhang, Brandon Garcia, Joseph Um, Bethanie Stadler, Rhonda Franklin

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper presents a phase analysis method (PAM) in DC field domain to detect ferromagnetic resonance (FMR) properties of magnetic nanowires. The S-parameter phase is extracted, and a derivative is applied to show FMR frequencies and magnetic moment direction. A comparison between the magnitude method and PAM is made. PAM provides advantages in determining FMR frequencies for overlapped linewidths. For a two-port coplanar waveguide (CPW) test circuit, the sample placement effect is studied. The phase derivative results show consistent FMR frequencies at DC field of 0.87T for different sample placements. Similarly, three different types of nanowires, iron (Fe), cobalt (Co) and nickel (Ni) are measured and can be easily distinguished. Finally, on a one-port shorted CPW test circuit, the length effect is studied. Two nanowire chips from one sample are diced with the same width but different lengths. When compared, their FMR frequencies possess differences of 0.06T using PAM.

Original languageEnglish (US)
Title of host publicationIMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781728168159
StatePublished - Aug 2020
Event2020 IEEE/MTT-S International Microwave Symposium, IMS 2020 - Virtual, Los Angeles, United States
Duration: Aug 4 2020Aug 6 2020

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Conference2020 IEEE/MTT-S International Microwave Symposium, IMS 2020
Country/TerritoryUnited States
CityVirtual, Los Angeles

Bibliographical note

Funding Information:
ACKNOWLEDGMENT This work was supported by the National Science Foundation (NSF) Award (ECCS #1509543) with portions conducted in the Minnesota Nano Center, an NSF National Nano Coordinated Infrastructure Network (NNCI -1542202).


  • Coplanar waveguide
  • Ferromagnetic resonance
  • Nanowires
  • Phase analysis
  • Scattering parameters


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