Approach to magnetic saturation in rapidly quenched amorphous alloys

Abstract

The law of' approach to ferromagnetic saturation is invcstigated for nearly noiim,~gnetostrictivc Co,,Fe,Ni,,B,,Si,, and for highly mirgnctostrictive Fe,,Ni,,,P,,B, amorphous alloys after differcnt thermal t.rentmcnt.s and annenlings under applied strosses which produce inelastic deformations. \Yhile thermal t,reat,merit,s modify the parameters of the law of approach t o saturation for tlio mirgnetostrictivc alloy, these parameters remain unclrangerl for the nearly non-magnetostrictive alloy. Moreover, it cim be concluded that for the Istter alloy, although macroscopically its sat'imt'ion magnetost'riction is of the order of 1 x 1oc:d fluctuations of tbc niagnetostrict'ion c i m rench values up to 2 x Das Einmundungsgesotz in die ferroinagnetische Siittigung mird fur nahezu niclitmlLanctostrilitive Co,,Pc,Ni,,B,,Si,,soivic hochmagnetostriktive Fo,,Ni,,P,,B,-Legierungen nach vcrschirdenen Anlal3behandlungen rind Anlassen unter angelegten Spannangen, die inelastisclie Deformationen erzcngen, untersncht. IViihrend thermische Beliandlungcn die Parameter dcs Einmiindungsgesetzes im Fall cler magnetostriktiven Legierungen verandern, bleibcn diese Parameter bci der nahezn niclitmagnetostriktiven Legierang unvcrandcrt. Ferner ergibt sich fur dieso Ict,ztero IRgierung, obgleicli deren makroskopische Magnetostriktion von der GroRenordnung lo-' ist, daJ31okii.le Fhilrtnntjonen drr Magnetostriktion IVcrtc bis zii 2 x 10-6 crrcichen konnen.

Effect of structural relaxations within the amorphous structure on the magnetic properties of amorphous tapes from FeCoB family

“…6 presents the linear relation fits describing the first principle of the approach to ferromagnetic saturation for test alloy samples in the state after solidification and after heat treatment. The value of the stiffness of spin wave parameter was determined based on the calculations carried out in accordance to [32,[39][40]. After the completion of the annealing process resulting in the relaxation of the material the value of the stiffness of spin wave parameter increased, which is consistent with previous assumptions.…”

Spin-Wave Excitations and Fluctuations of the Exchange Interaction in Amorphous Fe1-xZrxAlloys

“…The term AH-1 /2 is concerned with local random anisotropy [12]. This term was predicted also by Chudnowsky [13].…”

An Investigation Into The Effect Of Isothermal Annealing On Magnetic Properties In The Alloy: Fe64Co10Y6B20

“…Using the equation [25]: (1) where: g -Lande splitting factor, B µ -Bohr magneton, the spin-wave stiffness parameter Dspf, described by [26]: Table, it can be stated that, during the thermal treatment of the alloy, the re-grouping of the atoms leads to the change in parameters in relationship (2); in turn, this leads to a decrease in the value of the spin-wave stiffness parameter Dspf. The lower value of this parameter indicates a decrease in the number of magnetic atoms in the nearest neighbourhood, and smaller distances between them.…”

“…to an improvement in the thermal stability of the material. In the ferromagnetic materials, the effect is an increase in the number of magnetic atoms per unit volume, limiting the number of pinning centres; this has a positive influence, giving increases in the values of saturation magnetisation and spin-wave stiffness parameter and a decrease in the coercivity value, [15][16].…”