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IX. , , , , . VIII , . , . ? ? V , , . , , , , , ? , (.,, [1]). NdFeB, PrFeB, SmCo .. (, [2-4]). , (, , [5]). [6] , , [7,8] 1.2 . Ms [8,9], , , , D~100 . D , , , 1 10 , . 9.1. , 5 , 10 D1, . 9.1. .9.1. : [8]. , . . , . (), .. - 1 .

, , , . ? ( - - exchange length). . , , , . VI (6.21), = (A/K1)1/2 = 0, A = JS2/a - . 0 = / . Fe, J = 2.16 10-21 , S =1, = 2.86 10-10, 1 = 4.6 104 /3, = 7.5 1012 = 1.28 10-8 = 12.8 . (Random Anisotropy Model). [10]. . 9.2. D - 1. , , N = (0/D)3 V = (0)3, . N, , . , N , .. = K1/N = K1(N/ 0)3/2. (9.1) 0 , K1, .. 0 = (/)1/2. (9.2) 0 : , - , , , .9.2. . . 30-40 . . (9.1) (9.2), , ~ D6, (9.3) = (K14/ A3)D6, D< 0. , , , . Hc = pc (K1/Ms), (9.4) = p (Ms2/0K1), (9.4) pc p , ( ). - (9.4), (9.3) : Hc = pc (/Ms) pc (K14D6)/( MsA3), (9.5) = p (Ms2/0 ) p (Ms2 A3)/(0 K14D6), (9.5) .., (9.3), . .9.1, Hc, 1/, ~D6 40 . (9.5) -Fe-20 % Si pc = 0.13 p = 0.5. , : pc = 0.64 p = 0.33 [11].

, (9.4). -FeSi pc = 0.64, p = 0.33 Hc 35 A/cm (0.5) 70, Hc . = 0 = (A/K1)1/2 , ( pinning) . , Hc = pc (K1)1/2 /( MsD), (9.6) = p (Ms2 D)/(0 AK1)1/2, (9.6) pc 6 (3) p = 0.1 (0.2) 1800 (900) . 1/D 1/ .8.3. Ni-Fe MnZn (. , . 9.3). . , , , -, , , .. . = 21/Ms. (9.7) . , , , . fFMR= 0(MsHk)1/2, () (9.8) = geo/(2m) 2.2 105 /( ) , . .., Hk, . . 9.4. [12]. . . , , , , , . . 9.4 (21.5%Fe-Ni), 600 0 (, ) (.. « ») () [12]. () () . , , . . , , , .9.5. . . 9.6 FeZrN [13]. FeXN, = Ta, Zr, Tl . 1 . %, , [13] .9.5. , , , -Fe, .9.6. Fe, ( ) () N, . , .

[8].

. 9.6. FeXN.
. , . . , , , , . 9.7. , , , .

. 9.6. FeZrN [13].

.9.7. (a), (,) (,) [14].

(). . 8.7. ( ) ( , ) [14]. , , . 6.10. , , , , [15]. , (.9.7) - (.9.7). . [16,17], , (, stray field). 5 : 1)

ex = A (grad )2, (9.9) 2) u = Kusin2; (9.10) 3) k = Kf(,1,2,3); (9.11) 4) m = -HMcos(-); (9.12) 5) st = -(1/2)HstM. (9.13) , ; , Ku , , 1,2,3 , Hst . : (9.14) E =V(ex+u+k+k+m+st) =0 , , , , . , Keff N : Keff = K/N1/2, (9.15) (9.1). , , , , . 9.8. lL (A/Ku)1/2(HL/Hk+1)-1/2, (9.16) Hk=2Ku/Ms. .. (L=0, L ) (9.16) (9.2) 0. ( ) , .. . , . .9.8. . (9.14) . (9.13). . . , xy, . , . .., : Mx = M cos , My = M sin, = 0 sin(2x/). (9.17) z- . (9.17) , , [16,17], . , , . , : (r) = - div (M) = Msin(/x) - Mcos(/y) = (M02/) sin (4x/), (9.18) .. x. : U = (r')/|r'-r0|dV', (9.19) : Hstr(r0) = -grad(U). (9.20) (9.19) (9.20) - , d xy, [18],

Hstr,y = -U/y = -

-

( x' )dx' dz ' dy '
-d / 2 -

d /2

1 { } = 0, 2 y [( x'- x) + ( y '- y ) 2 + ( z '- z ) 2 ]1 / 2

(9.21)

. , z . z- : Hstr,z = -U/z = -Mo02sin(4x/)

-

cos(4 )d d
-

d +2 z 2 d -2 z 2

d [ + 2 + 2 ]
2

3/ 2

,

(9.22)

= (z'-z)/, =(y'-y)/, =(x'-x)/. (9.22) , : Hstr,z = -Mo02sin(4x/)Sz , (9.23) (9.24) Sz = (1/4)exp(-2d/)sh(4z/). d 0.6 z- . , x- : Hstr,x = - Mo02cos(4x/)Sx(z), (9.25) Sx(z) =

2 sin(4 )d
-

d -2 z 2

-( d + 2 z ) - 2

d

d [ + 2 + 2 ]3
2

/2

= (9.26) (9.27)

= exp[-(d-2z)/]sh[(d-2z)/]+ exp[-(d+2z)/]sh[(d+2z)/]. , [16] 0 = DK/{(4M)1/2(2d)1/4[AKu(HL/HK+1)3/8]}, D- , d .

[16]. =2(A/Ku)1/2(HL/HK+1)-1/2 = 2lL. .. 2- .

(9.28)

. 1. F.E. Luborsky, J. Appl. Phys.,v. 32, (1961) 171S 2. E. Kneller and Hawig, IEEE Trans. Magnetics, 27 (1991) 3588 3. S. Hirosawa, H. Kanekiyo and M. Uehara, J. Appl. Phys. , 73 (1993) 6488 4. O. Gutfleisch et al, JMMM, v. 242-245 (2002)1277 5. E. Pfeiffer and C. Radeloff, J. Mag.Mag. Mat., v. 19 (1980) 190 6. R. Boll and H.R. Radeloff, IEEE Trans. Magn., Mag-19, (1983) 1946 7. Y. Yoshizava, S. Ogumi and K. Yamauchi, J. Appl.Phys., v.64 (1988) 6044 8. G. Herzer, IEEE Trans.Magn., v.26 (1990) 1397 9. G. Herzer, Scripta Metallurgica et Materialia., v.33 (1995) 1741 10. R.Alben, J.J. Becker and M.C. Chi "Random Anisotropy in Amorphous Ferromagnets", J. Appl.Phys., vol. 49 (1978) pp.1653-1658 11. . . . - , , 1956, 784. 12. S. Chikazumi, Physics of Ferromagnetizm, Oxford University Press, 1997, p.299 13. A. R. Chezan, C. B. Craus, N. G. Chechenin et al , IEEE Trans. Magn., v. 38, (2002) 3144 14. N. G.Chechenin, , C. B.Craus, A. R.Chezan, et al, , IEEE Trans. Magn., 38, (2002) 3027. 15. .. , . , 2005 (http://danp.sinp.msu.ru) 16. H. Hoffmann, J. Appl. Phys. 35 (1964) 1790. 17. H. Hoffmann, Thin Solid Films, 58 (1979) 223 18. .. , « », , .46, .3 (2004) .466-470

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3. 4. 5. 6. 7.

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