Amplification factor of echo signals in ferrimagnetic materials

Author

How, Hoton ; Vittoria, Carmine ; Everett, Glen E.

Author_Institution

Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA

Volume

39

Issue

11

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

1828

Lastpage

1835

Abstract

It is known that spin echoes in ferrimagnetic materials can only be excited on the application of high-power microwave signals. The amplification factor of spin echoes is calculated for ferrimagnetic materials; long-range dipolar field, external RF-field couplings, and magnetization relaxations are included in the calculations. The inclusion of such interactions provides a mechanism by which realistic amplification of echoes may be calculable. The theoretical estimate of amplification is in reasonable agreement with previous experiments. Thus, the effects of carrier frequency, field gradient, and microwave power on echo amplification are calculated

Keywords

amplification; ferrimagnetic resonance; ferrites; garnets; microwaves; spin echo (EPR); yttrium compounds; YFe5O12; YIG; amplification factor; carrier frequency; echo amplification; echo signals; external RF-field couplings; ferrimagnetic materials; field gradient; high-power microwave signals; long-range dipolar field; magnetization relaxations; microwave power; spin echoes; Associate members; Couplings; Delay; Equations; Ferrimagnetic materials; Frequency; Magnetic materials; Magnetization; Pulse amplifiers; Pulse modulation;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.97483

Filename

97483