Field-induced parameters of re-entrant magnets and concentrated spin glasses

Jackson, Eric M.; Liao, S.B.; Bhagat, S. M.; Manheimer, M. A.

doi:10.1016/0304-8853(89)90123-6

Cited by 25 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(We neglect the Dzyaloshinskii-Moriya coefficient, which vanishes in bulk limit.) In that case, the above law is modified to 60 dq n q T = Li 3/2 e −ω0/kBT π 3/2 k B T D…”

Section: Spin Waves' Contribution To Magnetizationmentioning

confidence: 99%

Theory of spin waves in ferromagnetic (Ga,Mn)As

Werpachowska

Dietl

2010

Phys. Rev. B

View full text Add to dashboard Cite

The collective behavior of spins in a dilute magnetic semiconductor is determined by their mutual interactions and influenced by the underlying crystal structure. Hence, we begin with the atomic quantum-mechanical description of this system using the proposed variational-perturbation calculus, and then turn to the emerging macroscopic picture employing phenomenological constants. Within this framework we study spin waves and exchange stiffness in the p-d Zener model of (Ga,Mn)As, its thin layers and bulk crystals described by the spds* tight-binding approximation. Analyzing the anisotropic part of exchange, we find that the Dzyaloshinskii-Moriya interaction may lead to the cycloidal spin arrangement and uniaxial in-plane anisotropy in thin layers, resulting in a surface-like anisotropy in thicker films. We also derive and discuss the spin-wave contribution to magnetization and Curie temperature. Our theory reconstructs the values of stiffness determined from the temperature dependence of magnetization, but reproduces only partly those obtained from analyzing precession modes in (Ga,Mn)As thin films.Comment: 17 pages, 12 figures (added Eq. 36, replaced Fig. 10

show abstract

“…(We neglect the Dzyaloshinskii-Moriya coefficient, which vanishes in bulk limit.) In that case, the above law is modified to 60 dq n q T = Li 3/2 e −ω0/kBT π 3/2 k B T D…”

Section: Spin Waves' Contribution To Magnetizationmentioning

confidence: 99%

Theory of spin waves in ferromagnetic (Ga,Mn)As

Werpachowska

Dietl

2010

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Figure 8 shows that Eq. (11) works quite well above the character-istic temperature Tf as predicted in [12]. At low temperatures (T < Tf), where one expects the breakdown of IFN, the model assumes δ-like density of states …”

Section: Reentrant Transition (Ree)mentioning

confidence: 65%

“…The experimental results presented above can be interpreted on the basis of the model proposed in [12,13]. The model invokes an energy gap ∆r in the dispersion relation for magnons E = ∆r + Dk2 .…”

Section: Reentrant Transition (Ree)mentioning

confidence: 88%

“…The temperature dependence of saturation magnetization in that case distinctly deviates from the behaviour given by the spin-wave model. The model proposed in [12,13] was used to account for the observed behaviour of Ms . The dispersion relation of magnons was modified by including the energy gap ∆r with non-zero density of state.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 9 shows the experimental data on Ms vs. Tf o r t h i s f i l m a l o n g w i t h the numerical results given by Eq. (12). From the best fit to the experimental data two fitting parameters ∆s and Cs were obtained.…”

Section: Spin-wave Resonance In Magnetic Semiconductor Thin Films mentioning

confidence: 99%

See 2 more Smart Citations

Spin-Wave Resonance in Magnetic Semiconductor Thin Films - Experiment

Maksymowicz¹,

Lubecka²,

Powroźnik³

1991

Acta Phys. Pol. A

View full text Add to dashboard Cite

Magnetic properties of polycrystalline thin films of chromium chalcogenide spinels (CdCr2Se 4 lightly doped with indium and CdCr2xIn2-2xSe4) were studied. The ferromagnetic (FMR) and spin-wave resonance (SWR) techniques were used to investigate the temperature dependences of both the spin-wave stiffness constant D and the saturation magnetization Ms . The resonance spectra were recorded in the temperature range extending from 4.2 K to 300 K. The influence of indium concentration on M s (T) and D(T) was studied. It was shown that lightly doped samples (In/Cd < 1% at.) exhibited the ferromagnetic ordering with Ms (T) and D(T) being the linear functions of T3 /2 and T512 , respectively. Higher concentration of indium produced the reentrant transition and spin-glass state of magnetic ordering in CdCr2 x In2-2xSe4. The temperature dependence of M. was also found from the FMR data for these two magnetic phases.

show abstract