Pressure and Temperature Dependence of the Fe57 Nuclear Magnetic Resonance Frequency in Ferromagnetic Iron

1961 ◽  
Vol 32 (3) ◽  
pp. S106-S110 ◽  
Author(s):  
G. B. Benedek ◽  
J. Armstrong
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Temperature Dependence ◽  
Magnetic Resonance Frequency ◽  
Nuclear Magnetic Resonance Frequency ◽  
Ferromagnetic Iron ◽  
Nuclear Magnetic

Further studies of the enhanced nuclear magnet HoVO 4 - II. Experiments with acoustic waves

1988 ◽  
Vol 416 (1850) ◽  
pp. 75-81 ◽  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Acoustic Waves ◽  
Acoustic Resonance ◽  
Resonant Absorption ◽  
Tetragonal Symmetry ◽  
Magnetic Resonance Frequency ◽  
Experimental Apparatus ◽  
Nuclear Magnetic Resonance Frequency ◽  
Nuclear Magnetic

Acoustic measurements on single crystals of HoVO 4 at a frequency of 800 MHz (Bleaney et al., Proc. R. Soc. Lond . A 388, 479 (1983 a )) revealed the presence of both non-resonant acoustic absorption at low appliedfield strengths and resonant absorption at the enhanced nuclear magnetic resonance frequency. In a recent paper (Bleaney & Gregg Proc. R. Soc. Lond . A 413, 313 (1987)) the theory of such acoustic resonance in enhanced nuclear paramagnets has been extended to include other acoustic modes for ions at sites of tetragonal symmetry. In this paper the advantages of using acoustic waves rather than conventional nuclear magnetic resonance for the region 1-2 GHz is described, together with the preparation of transducers of ZnO and the experimental apparatus. Measurements of the acoustic velocities at 1 GHz in HoVO 4 are compared with those of (Goto et al., J. Phys. Soc. Japan 55, 1613 (1986)) at 10 MHz. Further measurements of the non-resonant and resonant attenuation will be presented in papers III and IV (Bleaney et al., Proc. R. Soc. Lond . A 416, 83; 93 (1988)), together with the appropriate theory.

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