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МАГНИТНАТА АНИЗОТРОПИЯ и прочия... ( ПРИЛОЖЕН МАГНЕТИЗЪМ) PowerPoint PPT Presentation


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МАГНИТНАТА АНИЗОТРОПИЯ и прочия... ( ПРИЛОЖЕН МАГНЕТИЗЪМ). Доц. д-р Михаил Михов Физически факултет на СУ “Св. Кл. Охридски” Юни, 2011 г. http://elearning-phys.uni-sofia.bg/~mikhov. Основната магнитна величина магнитен момент - M. Постоянен магнит. Постоянен магнит.

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МАГНИТНАТА АНИЗОТРОПИЯ и прочия... ( ПРИЛОЖЕН МАГНЕТИЗЪМ)

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4346924

...( )

. -

. .

, 2011 .

http://elearning-phys.uni-sofia.bg/~mikhov


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-M

- I

. -

. -B

. -


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,

Fe, Co, Ni, Gd,

MnAs, MnAl, Fe-, SmCo5, Nd2Fe14B, ..,

Fe3O4, CoFe2O4, BaFe12O19, ..,

....


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-- -

- Hc


30 10 9 us

30109US$


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8

!


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-

,

:

3d- Cr, Mn, Fe, Co, Ni, 2 5 B

4f- Nd, Pr, Dy, Gd, Ho, Tb, 2 10 B


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-


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()

- Wex

,, ,C:

< C, Wex > kBT.

>C, kBT>Wex

.


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!!

!!

...


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,

  • ;

  • ;

  • ;

  • ;

  • ;

  • ;

  • ...


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:

()

( .)


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, -,

()

c


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-

[100], [010],[001]-


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Ni

-

<111>-


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.


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!


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Wa = Kusin2


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Wa - .


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-; .


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1.

-

( )

2.

( )


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-

, .

Wso ~ -Hl.s

!


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-


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d- .


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.

NaCl


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.

3d- .


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.

3d- .


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  • ( -) ;

  • ;

  • ;

  • , ( -) - ;

  • , , - !


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  • :

  • ;

  • ;

  • ;

  • !


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-

WH = -M.H

T= H

(T )

H = f(M, r)


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<

.


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( , HD)


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( , HD)

. , Hi,

-

, H.

HD


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( , HD)

HD


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WH = -i.Hi

WDa< WD


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WDc< WDa


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,


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  • :

    • , Wex,

    • , Wa,

    • , HD,

    • , WH,

    • , Wstr,

  • .


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!


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( )

A ~ Wex


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( )

A K :

  • (),

  • ,

  • ,

  • .

    .


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( )


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-Fe2O3, () .


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(Alnico: Fe-Co-Ni-Al)

Hc 270 kA/m (3400 Oe)

(BH)max 30 kJ/m3

Fe-Co


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() (GMR)


T t t

T .. t-t

,

,

.


T t t t

T t t' = -t

T:t t' = -t

t'= - t

v' = - v

l'= - l

' = -


T t t t1

T t t' = -t

T:t t' = -t

t'= - t

I'= -I

H' = -H


T t t t2

, .

T t t' = -t

=

WH = ()-i.Hj

(i j)


T t t t3

T t t' = -t

, .


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-


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.


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200 Gbpsi.

2010 . Western Digital Corp. 3 Tbit .


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:

20 m

. .


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Co-Pt-Cr

GMR

.

Nd2Fe14B ,

Nd2Fe14B -


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Nd2Fe14B


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, .

,

- :


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!


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