Thermal Magnetic Noise From Synthetic Antiferromagnets in Magnetoresistive Heads

Thermal magnetic noise in magnetoresistive read heads was studied extensively in recent years. It is believed that thermal magnetic noise is becoming the dominant noise source in read heads for hard-disk drive applications. Most previous work concentrated on magnetic white noise from free layers. Th...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-10, Vol.45 (10), p.3484-3487
Main Authors: Lei Wang, Edelman, H.
Format: Article
Language:English
Subjects:
Analytical models
Antiferromagnetic materials
Antiferromagnetism
Coherence
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fluctuation
Hard disks
Magnetic domains
Magnetic heads
Magnetic noise
magnetic simulation
Magnetic tunneling
Magnetism
Magnetoresistance
magnetoresistive read heads
Materials science
Mathematical analysis
Micromagnetics
Noise
Other topics in materials science
Physics
Read heads
TMR heads
Tunneling
White noise
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Summary:Thermal magnetic noise in magnetoresistive read heads was studied extensively in recent years. It is believed that thermal magnetic noise is becoming the dominant noise source in read heads for hard-disk drive applications. Most previous work concentrated on magnetic white noise from free layers. This work shows that magnetic noise from a synthetic antiferromagnet can be comparable to that from a free layer in tunneling read heads for current and future hard-disk drives. An analytical model is established for thermal magnetic noise based on the single domain particle assumption. The model agrees well with results from a full micromagnetic model. This indicates that magnetic thermal fluctuations in current tunneling heads are close to being coherent.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2022186