Magnetic anisotropy and the complex magnetic permeability of Fe 73.5-Cu1-Ta3-Si13.5-B9 Magnetic alloy

Abstract

Fell j .eu I - Ta.;-SII J 5 - R" magncllC alloy has beel! prepared in the form ot'ribh,,!! by single mlle,- meil",p'llfIing lechnique '" air, 111 order 10 study the cJleer of Til on Ihe magllelolramp"n propemes of this lIano('ry!Jwllinc 5()ji magnetic alloy. lemperalure and field dependenl reo, Iw ivily (IS well m maglJt'/oresislGnre have been evaluated u,~ing convenlional 4-probe leC'hniquc. The value uj'nwgnelol'csiswnce is/ouilil /() Val)' bel',,'en (1-6) percenl al room lemperawre, which II IIcorly half (~rdun 10 the typically kllown Willie oj Ihi" class of Finemel. In ,he low IcmpCl'(Il/Ire region, (his alloy <,sili!!!ts ,I'cmlconduclillg behaviour a"d 11.1' magnelorcsisll1llGe is found to Iww a slight illcrease wilh the external "pplied magnelicjields, Tim' alloy aMbits metallic behaviour in IlIe high lemperalUre range since 11/01'1' ""d filore conduclion electron,' partlcipaling in Ihe conduction mechanism. Induced u"ilLtia/ magnetic anisolropy, developed during Ihe growlh proo'.\'.I'. is found 10 decrease with temperalure due 10 Ihe weaker fcrromaglletk coupllllg in th,' amorphous malrix. By Ihe extrapoIalion of Ku vs T curve, Ihe Cutie temperalure, '[C is eslimated 10 be around 587 K. The coercivity, H,. hm! been found to decrease and the inilial perrl/eabJiily, J-I'is observed 10 increase with lemperature. The initial permeabilily of as ca,I'1 sample is .iound w be in Ihc order of uf, which is I" agreemen! wil/r Ihe ""Iue. reporled earlier On IIIISelm'.' oj'other Finemcts. The complex permcabilily oj'thts blp!wsc nar/OCiystallinc magnetic al/oy has been measurcd("r "olh (IS casl and {IIllIm/cd ""mples. AI/ower annealing lemperatures, "olh Ihe real and imaginary parts oj' Ihe complex permeability were jimnd to increase witli annealing tClI/pcra"'re due 10 more local !>egrcgali()n.,.Thc limiling ami resonance j!'e'IUetlcin (4 Wllleo/ed .\lHllpies decrease wilh annealing lelllpCJ'(llured"e 10 structural alld lopologieal relaxation. The real part o( the permeability IS found 10 illcrease bdow IlIls limiti"g j!'equen<y tllm Wn be a.,cribed 10 the homogeneous c/range of nwgnelization by the .Ipill rolatton Whereas. the same i.1 fotlnd 10 decrease above Ihi.' lillliling frequency. whiCh <:"nbe a/lnbutive to the enl"lIlcemelit oj' exchange slij)i1e,'.1eOllstall1 (Aj, expected 10 originatejram tile mogneloelea.l/ic contrihwilJll due 10 Ihe paramagnellc ~!Jeel of Ta, The exponelliial increase of the reactive component (Xj IIldiC(lres thai lite studied sample is oj'illduclive nature. The variation of i"ductance (I), calculated j'rom rhe mcasured Impcdance, is found to decrease up to 30 MHz and aflerwards relllaillS alJilo.ll cansll1nt, which ,,- prr!"l'ective 10 be used in .fabrtcation ol ","/lt-layer chip induclOn, The iJ{/urcalion u.lreal pat'! uf complcx permeabililY at 400-millivoll oscillaliun-Icvcl tS ('lIl/.1cdhy I/Ic magnt'li:ation Ihal i~fi!rccd {()align parallel by cxchallge inlerfl('lion.