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Low frequency magnetic response in antiferromagnetically coupled Fe/Cr multilayers
F G Aliev1, J L Martinez, V V Moshchalkov
1Instituto de Ciencia de Materiales "Nicolas Cabrera", Departamento de Fisica de la Materia Condensada, C-III, Universidad Autonoma de Madrid, 28049 Madrid, Spain.
Physical Review Letters
|May 15, 2002
Summary
This study investigates the magnetic response of iron/chromium multilayers. At low temperatures, magnetic relaxation times show strong frequency and field dependence, possibly due to quantum tunneling.
Area of Science:
- Condensed matter physics
- Materials science
- Magnetism
Background:
- Antiferromagnetically coupled Fe/Cr(100) multilayers exhibit complex magnetic behaviors.
- Understanding magnetic relaxation is crucial for spintronic applications.
Purpose of the Study:
- To investigate the magnetic field and temperature dependence of low-frequency magnetic response in Fe/Cr(100) multilayers.
- To explore the relaxation dynamics and their relation to magnetoresistance and quantum phenomena.
Main Methods:
- Studied magnetic response of epitaxial Fe/Cr(100) multilayers.
- Varied magnetic field strength (+/-500 Oe) and temperature (2-300 K).
- Analyzed frequency dependence and relaxation time.
Main Results:
- Observed strong frequency dependence of magnetic losses at 2 K.
- Characterized a single relaxation time scheme that is highly field-dependent.
- Correlated these phenomena with large magnetoresistance in epitaxial multilayers.
Conclusions:
- The low-temperature relaxation behavior suggests potential involvement of quantum tunneling processes.
- Findings offer insights into the magnetic dynamics of Fe/Cr multilayers.
- Highlights the unique properties of epitaxial structures with significant magnetoresistance.