Antiferromagnetic and Ferrimagnetic Resonance

Foner, S.

doi:10.1016/b978-0-12-575301-2.50016-x

Cited by 31 publications

(18 citation statements)

References 145 publications

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“…The subject has been investigated theoretically by Kumar, Kurkijä rvi, and Oja (1986) and by Oja (1995, 1996). Their work is based on the vast number of papers on antiferromagnetic resonance in electronic magnets that have been reviewed extensively by Foner (1963), Keffer (1966), and Akhiezer et al (1968). However, there are several complications that hamper direct application of this early work to the present case.…”

Section: E Nmr Response Of Type-i Structuresmentioning

confidence: 99%

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

1997

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This paper is a comprehensive review of almost twenty years of research on nuclear magnetic ordering, first in copper and later in silver and rhodium metals. The basic principles of nuclear magnetism and the measurement of positive and negative spin temperatures are discussed first. Cascade nuclear refrigeration techniques, susceptibility and nuclear-magnetic-resonance (NMR) measurements, and arrangements for neutron-diffraction experiments at nanokelvin and picokelvin temperatures are described next. Comprehensive magnetic-susceptibility and neutron-diffraction measurements on copper, which led to the discovery of at least three antiferromagnetic phases, one displaying the novel (0 2 3 2 3 ) spin structure and the other two showing the type-I order of the fcc system, are then described in detail. NMR data on silver, at TϾ0 and TϽ0, are presented next leading to the observation that silver orders antiferromagnetically at positive spin temperatures and ferromagnetically at negative spin temperatures. The authors discuss recent neutron-diffraction measurements that show that the antiferromagnetic structure at TϾ0 is in a single-k type-I state. NMR data on rhodium at TϾ0 and TϽ0 are also described. Results obtained on Tl, Sc, AuIn 2 , and metallic Pr compounds and on insulators like CaF 2 are then discussed briefly. The paper is concluded by an extensive theoretical section. Calculations of conduction-electron mediated exchange interactions are described, and the mean-field theory of nuclear magnetic ordering is presented. The role of thermal and quantum fluctuations is then discussed, particularly in the selection of the antiferromagnetic ground state. Finally, theoretically calculated magnetic phase diagrams and ordered spin structures of copper and silver are presented in detail and compared with experimental results. The overall agreement is good, affirming the value of nuclear magnets in Cu and Ag as realizations of simple physical models. [S0034-6861(97)00301-2] ogy,

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Section: E Nmr Response Of Type-i Structuresmentioning

confidence: 99%

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

1997

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“…In addition, the strongest ESR resonance vanishes below 6 T, which is expected to occur when the applied field is less than the spin-flop field 30 and is further consistent with a µ 0 H sf 6 T.…”

mentioning

confidence: 65%

Magnetic ground state of the two isostructual polymeric quantum magnets[Cu(HF2)(pyrazine)2]SbF6and
Brambleby
¹
,
Goddard
²
,
Johnson
³

et al. 2015
Phys. Rev. B

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The magnetic ground state of two isostructural coordination polymers (i) the quasi twodimensional S = 1/2 square-lattice antiferromagnet [Cu(HF2)(pyrazine)2]SbF6; and (ii) a related compound [Co(HF2)(pyrazine)2]SbF6, were examined with neutron powder diffraction measurements. We find the ordered moments of the Heisenberg S = 1/2 Cu(II) ions in [Cu(HF2)(pyrazine)2]SbF6 are 0.6(1)µb, whilst the ordered moments for the Co(II) ions in [Co(HF2)(pyrazine)2]SbF6 are 3.02(6)µb. For Cu(II), this reduced moment indicates the presence of quantum fluctuations below the ordering temperature. We show from heat capacity and electron spin resonance measurements, that due to the crystal electric field splitting of the S = 3/2 Co(II) ions in [Co(HF2)(pyrazine)2]SbF6, this isostructual polymer also behaves as an effective spin-half magnet at low temperatures. The Co moments in [Co(HF2)(pyrazine)2]SbF6 show strong easy-axis anisotropy, neutron diffraction data which do not support the presence of quantum fluctuations in the ground state and heat capacity data which are consistent with 2D or close to 3D spatial exchange anisotropy.

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“…Recall that Equation 44 is correct only at low temperatures ( T ≪ T N ) and neglects all nonlinear terms. Further corrections taking into account the Van Vleck paramagnetism are possible when the temperature dependent susceptibility ratio χ || /χ ⊥ is predetermined [88]. …”

Section: New Challenges For Xdmrmentioning

confidence: 99%

“…When the external field B 0 approaches the critical field B C 1 = [2 B E B A − B A 2 ] 1 / 2 < B C 2 , the magnetic system undergoes a first order transition (spin-flop) resulting in the new situation sketched in Figure 9C and which is characterized by a noncollinear ground state [88]. It is well documented that, in the spin-flop phase, a new resonance mode associated with the total magnetization M = M 1 + M 2 will be pumped:…”

Section: New Challenges For Xdmrmentioning

confidence: 99%

“…With a much higher exchange field combined to a low anisotropy field [88,96], the case of Cr 2 O 3 (T N = 308 K) looks less favorable even though we already produced definitive evidence of orbital magnetism in this crystal, at least in its magnetoelectric phase [97]. Although the spin-flop critical field of Cr 2 O 3 is rather low ( B C 1 ≃ 5.9 T), it cannot be taken yet for granted that Δ m ⊥ ( ± ) will be large enough to yield a XDMR signal easily detectable at microwave pumping frequencies.…”

Section: New Challenges For Xdmrmentioning

confidence: 99%

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X-Ray Detected Magnetic Resonance: A Unique Probe of the Precession Dynamics of Orbital Magnetization Components

Goulon

Рогалев

Goujon

et al. 2011

IJMS

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X-ray Detected Magnetic Resonance (XDMR) is a novel spectroscopy in which X-ray Magnetic Circular Dichroism (XMCD) is used to probe the resonant precession of local magnetization components in a strong microwave pump field. We review the conceptual bases of XDMR and recast them in the general framework of the linear and nonlinear theories of ferromagnetic resonance (FMR). Emphasis is laid on the information content of XDMR spectra which offer a unique opportunity to disentangle the precession dynamics of spin and orbital magnetization components at given absorbing sites. For the sake of illustration, we focus on selected examples in which marked differences were found between FMR and XDMR spectra simultaneously recorded on ferrimagnetically ordered iron garnets. With pumping capabilities extended up to sub-THz frequencies, high-field XDMR should allow us to probe the precession of orbital magnetization components in paramagnetic organometallic complexes with large zero-field splitting. Even more challenging, we suggest that XDMR spectra might be recorded on selected antiferromagnetic crystals for which orbital magnetism is most often ignored in the absence of any supporting experimental evidence.

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Antiferromagnetic and Ferrimagnetic Resonance

Cited by 31 publications

References 145 publications

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Magnetic ground state of the two isostructual polymeric quantum magnets[Cu(HF2)(pyrazine)2]SbF6and
Brambleby
¹
,
Goddard
²
,
Johnson
³

et al. 2015
Phys. Rev. B

X-Ray Detected Magnetic Resonance: A Unique Probe of the Precession Dynamics of Orbital Magnetization Components

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Antiferromagnetic and Ferrimagnetic Resonance

Cited by 31 publications

References 145 publications

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Nuclear magnetic ordering in simple metals at positive and negative nanokelvin temperatures

Magnetic ground state of the two isostructual polymeric quantum magnets[Cu(HF2)(pyrazine)2]SbF6andBrambleby1, Goddard2, Johnson3 et al. 2015Phys. Rev. B

X-Ray Detected Magnetic Resonance: A Unique Probe of the Precession Dynamics of Orbital Magnetization Components

Contact Info

Product

Resources

About

Magnetic ground state of the two isostructual polymeric quantum magnets[Cu(HF2)(pyrazine)2]SbF6and
Brambleby
¹
,
Goddard
²
,
Johnson
³

et al. 2015
Phys. Rev. B