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ÐеждÑнаÑÐ¾Ð´Ð½Ð°Ñ ÐºÐ¾Ð½ÑеÑенÑÐ¸Ñ ÑÑÑденÑов, аÑпиÑанÑов и молодÑÑ ...
ÐеждÑнаÑÐ¾Ð´Ð½Ð°Ñ ÐºÐ¾Ð½ÑеÑенÑÐ¸Ñ ÑÑÑденÑов, аÑпиÑанÑов и молодÑÑ ...
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Ih^k_dpbynbabdbfZ]gblguoy\e_gbc 149<br />
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⎛∂M<br />
⎞<br />
∆ S = ∫ ⎜ ⎟<br />
⎝ ∂T<br />
⎠<br />
Gh\hdj_klghklbnZah\h]hi_j_oh^Zi_j\h]hjh^Zwlh\ujZ`_gb_g_\uihegy_l<br />
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gh]h i_j_oh^Z \ Zglbn_jjhfZ]g_lbd_ – y\e_gby khklhys_]h \ hijhdb^u\Zgbb ih^j_<br />
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F = E A + E H = − K U cos 2 Θ − (½)χ H 2 = − K U cos 2 Θ − (½)(χ || cos 2 Θ + χ ⊥ sin 2 Θ) H 2<br />
=^_K U –dhgklZglZZgbahljhibbχ || bχ ⊥ –ijh^hevgZybihi_j_qgZy\hkijbbfqb\hklb<br />
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Hcr<br />
=<br />
H<br />
dH<br />
2 KU<br />
χ⊥ − χ ||<br />
Wgljhibyh[jZapZhij_^_ey_lky\ujZ`_gb_fS = −(∂F/∂TLh]^ZkdZq_dwgljh<br />
ibbijbi_j_oh^_[m^_ljZ\_gjZaghklbwgljhibb^\monZa<br />
⎛∂χ k<br />
S ⊥ ⎞ ⎛∂χ<br />
⎞ ∂<br />
∆ = ⎜ ⎟H − ⎜ ⎟H<br />
−<br />
⎝ ∂T ⎠ ⎝ ∂T ⎠ ∂T<br />
2 || 2 u<br />
1/2<br />
CR<br />
1/2<br />
CR<br />
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aZlvqlh<br />
⎛∂χ<br />
χ<br />
⊥ ⎞ ⎛∂<br />
2 || ⎞ ∂k<br />
1/2 1/2 2 u<br />
⎜ ⎟HCR<br />
− HCR<br />
S T<br />
⎜<br />
T<br />
⎟ −<br />
∆ ⎝ ∂ ⎠ ∂ ∂T ∂HCR<br />
=<br />
⎝ ⎠<br />
=−<br />
∆I χ H −χ<br />
H ∂T<br />
⊥<br />
CR<br />
LZdbf h[jZahf \u[jZggZy fh^_ev hdZau\Z_lky kh]eZkh\Zgghc k mjZ\g_gb_f<br />
DeZci_jhgZ–DeZmabmkZ<br />
JZ[hlZih^^_j`ZgZ]jZglhfJNNB04-02-16709-Z.<br />
Ebl_jZlmjZ<br />
1. Gschneidner K.A. Jr, Pecharsky V.K. Journ. Appl. Phys. 85 (1999), 5365.<br />
||<br />
CR