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Document type:
Zeitschriftenaufsatz 
Author(s):
B̈oni, P.; Hennion, M.; Martínez, J. L. 
Title:
Magnon Dispersion of the Dipolar Ferromagnet {{EuS}} near the Zone Center 
Abstract:
The dispersion of the spin waves in EuS has been investigated by means of neutron scattering. In zero field and at small momentum transfer q, the energy $\Elzxh\omega$q of the spin waves is proportional to q in agreement with the predictions of spin-wave theory that includes demagnetization effects. By application of a magnetic field H$\parallel$q, the spin waves attain a finite mass, i.e., a gap is induced and $\Elzxh\omega$q becomes proportional to q2. Using polarization analysis we show that...    »
 
Journal title:
Physical Review B 
Year:
1995 
Journal volume:
52 
Month:
oct 
Journal issue:
14 
Pages contribution:
10142