Prediction of spike noise based on soft underlayer energy minimization

M. U. Khan, Randall H Victora

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


An energy minimization and balancing approach was adopted to predict the occurrence of spike noise by obtaining estimates of the magnetostatic and total wall energy of a soft underlayer (SUL) for a given configuration of domain walls. We find that single-layer SULs (thicknesses of 100-200 nm) are usually sources of spike noise unless their saturation magnetization is below 70-100 emucc. However, the use of such low-moment SULs is unacceptable in perpendicular recording. One solution that has been advocated is a multilayer SUL structure with C, Ta, etc., interlayers. Our predictions show that the ground state of a 200-nm double-layer FeCoC SUL is completely spike-free.

Original languageEnglish (US)
Article number10N502
JournalJournal of Applied Physics
Issue number10
StatePublished - May 15 2005

Bibliographical note

Funding Information:
The authors acknowledge funding support from Samsung and Jyotirmoy Saha for fruitful discussions.


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