SCIENTIFIC ABSTRACT IGNATCHENKO, V.A. - IGNATENKO, A.YE.

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CIA-RDP86-00513R000518330001-0
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December 31, 1967
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SCIENTIFIC ABSTRACT
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4 3/058/61/000/012/064p83 A058/A201 AUTHORS: Rodiobev, A.M., Ignatchenko, V.A., Salanakly, N.M, ----------------- Tr=: Evaluating the.Barkh~usen Jump PERIODICAL: Referativnyy zhurnal. Fizika, no. 12, 1961, 385, abstract 12E700 (V ab. "Magnitn. struktura ferromagnatikovff, Novosibirsk, Sib. otd. AN SSSR* 1960# 113 - 121) TEXT: The Barkhausen Jump is regarded as a variable magnetic dipole with magnetic moment m-m(t). The emf Induced by the dipole field In sIngle-layer and multilayer measuring coils is determined. It is assumed that field H is parallel or antiparallel to domain magnetization. 'It is shown that incident to evaluation of the Barkhausen jump, length 1 of the measuring coil has a great effect on measurement results; for the error not to exceed 10%, the condition 1 ;00 40D must be observed (D being the mean diameter of the measuring coil). Maximum accuracy can be achieved if 1 exceeds specimen length by 2D. It is noted that experimental setups for measuring the Barkhausen jump that do not contain special integrating elements or that have a measuring coil for a pickup can only be graduated in Card 112 Evaluating the Barkhausen jump 8/058/61/000/012/064/083 A058/Aiol terms Or dm/dt. On the basis of an experiment simulating the Barkhausen jump, it was found that the formulae Of the present work can be utilized for specimens with d 4 0.6 mm (d is specimen diameter). L. Vinokurova (Abstracter's note: Complete translation] Card 2/2 s/o58/61/ooo/ol2/066/083 A058/A101 AUTHORS- Ignatchenko, V.A., Rodichav, A.M. TrUE: Cbncerming the distribution in magnitude of Barkhauzen Jumps FMODICALt ReferativnYY zhurnal. FIzIka, no. l'92, 1961, 385, abstract 12E702 t%V ab. "Magnitn. struktura ferromagnetiicV', Novosibirsk, Sib. Otd. AN SSSRP 1960, 123 - 127) TEXT: The distribution in magnitude of the Barkhausen Jumps is associated with how ordered in structure the-specimen is. It is pointed out that experimental setups having only one measuring coil for a pickup..can only measure one component of the rate of change dmO/dt of the magnetio moment incident to Jumps, for in- stance in the case of field H parallel to the Z-axis of the coil dm2/dt. If,how- ever, the texture degree W is known, then the V. distribution (VO being the volume remagnetized as a result of Barkhausen Jumps) can be determined on the basis.of the measured distribution of moz, A caloulation method is provided. In the case V of a single crystal (the V. distribution being known) the degree of ordering of domain structure (W) is determined from the measured moz distribution. Calcula- Card 1/2 Concerning the distribution 8/058/6i/boo/ol2/o66/,o83 A058/A101 tion results were qualitatively borne out by experimental verification on Fe-31 single crystals and polyarystala. [Abstracter's notes Complete translation] L. Vlnokurova Card 2/2 5/126/6 0/009/03/022/033 E032/E414 V.A. and VansovskiY, S-V' AUTHORS1 ~1~naatcchh~eannkmOo the Magnetoslast" the Formula for TITLE1 on the Form Of EniLM of a perromagnOtic 2-1 196o, Vol 9, Nr 3, X/ allovedeniyei Fizika metallov i met PERIODICAL$ pp 456-457 (USSR) ula for the density of ation of their form ; (Ref 1) ADSTRAvrt -In the deriv energy, Becker and Dorinj repeated in magnetoelast'c This W&a Let introduced a Mall inaccur&CY* iv&tion (Ref 2,3). this subsequent versions Of this der in the derivation Of some of the steps -I' which dep nds us reproduce anisotropy energ be writt:n in formula. The part Of tions may on the powers of forced deforma ula the e form given by Eq (1). In this form . is neglected th pure volume change fo - 0). dependence 0 f fa On L, uik a-0, j L k, then ti n (when ull -.u22 I uY.5 the elastic deforma, i are the components Of f the vector 9 H re Uik Mi are the direction cosines 0 is written M.Or, elastic moduli and fu r are the It is well-known (cf fo 1"~ C2 and c3 given by Eq W* the in the form 2 or 4) that for a free cubic crystalg card 1/3 example Ref S/126/60/009/03/022/033 E032/E414 On the Form of the Formula for the Magnetoelastic Energy of a Ferromagnetic components of the deformation tensor are related to the components of the stress tensor by the relation given in Eq (3). A substitution of Eq (3) into Eq (1) leads to the expression given by Eq In previous derivations, the term 1 5 dii was neglected since it in independent of ai. However, this approximation robs the formula of any clear physical meaning. It is therefore suggested that the full Eq (4) should be used for fa. Let us consider expressions for fa in certain special cases. If the crystal is subjected to uniform extension (compression) in the direction yl;)Y2, Y31 then Oik = OYiYk and fd is given by Eq ( . If the spontaneous magnetization in directed alone the "easy" direction (along Clod] for iron Card 2/3 and along 111 for nickel) then f. is given by theo S/126/60/009/03/022/033 E032/E414 On the Form of-the Formula for the Magnetoelastic Energy of a Ferromagnetic expressions in Eq (6) respectively, the angle between the direction Of ex where y is magnetization. tension and the Finallyp in the isotropic magnetostriction approximation for an arbitrary orientation of. 100 0 X111 and -~B. relative to the crystallographic axis, F. is gi-?n by Eq (7). There are 4 references, 2 of which are Soviet, 1 German and I English. This is a complete translation. ASSOCIATIONStInstitut fiziki Sibirskogo otdeleniya AN SSSR (Institute of Physics of the Siberian Branch AS USSR) lnstlit-u--t ~fiziki Metallnv AYJ CO- (Institute of P) USSR) SUBMITTEDt February 39 196o Card 3/3 - S/126/60/009/05/019/025 OR324E na%natchenkOt V-A Polivanov, K9M*1 Rodichev, A, -Eics on the AUTHORS: r Ferroma jznel ;P1 TITLE: The Effect of the Parameters 01 ff-ect Measurements of the Barkhausen E PERIODICALS. Fizika metallOv I met allovedeniye, 1960, Vol 91 Nr 5, PP 778 - 789 (USSR) is usuallyttudied by measuring the ABSTRACT: The Barkhausen effect ng the ferromagnetlc emf induced in a coil surroundi ecimen. The emf Pulses induced in this coil by dis- sp etization are the only source continuous changes In the magn of information about this phenomenon, The time interval between successive pulses can be made quite large by a suitable choice of the linear dimensions of the specimen and the rate of change in the magnetic field H . Under such conditions each emf pulse corresponds to a single discontinuity. The present paper is concerned w-ith the determination of the relation3hip between the pulse parameters and the volume of the region in the ferro- magnetic within which the discontinuous change in the magnetization takes place, the increase in the magnetization, Card 1/2 the change in the magnetic moment, the duration and the r&t-e CL~~ S/l26/6O/oo9/o5/ol9/O25 The Effect of the Parameters of FerromaEgRON164n the Measurements of the Barkhausen Effect ASSOCIATION: Institut fiziki USSR) SUBMITTED: December 15, 1959 Card 2/2 AUTHORS: TITLE: PERIODICAL: AN SSSR (Institute of Physics of the /126/60/009/o6/OJ5/025 EOJ3~E335 RodicheV2 A~M, and IgtAatchenkot Dynamics of the Barkhausen vedeniye, 1960, Vol 9, Nr 6, Fizik& Metallov i metallO pp 903 - .908 (USSR) r of the movement The authors investigated the characte The ABSTRACT: ary during a Barkhausen jump. omata bound ollowing m8chani*ml of the d attribted to the f H Barkhausen Jump is ase of the magnetic field in the case of a slow incre s in such a way that the boundary between domains displace of the Sum A all at each instant of time the conditions ed. If magnetic energies having a minimum are fulfill the boundary hits a bqrriers it may impede its movement' lution is obtained df the equation of In this paper a 10 een written taking into consideration motion which has b cting on the boundary and formulae are the basic forces a nce of the duration derived which establish the depende aracter"tics of-the and speed of the Process on various ch . In another paper (Ref 8Y, the authors forromagneti0e ributiOil Of rep rt on the measurement of the dist 0 ion of pulse durations in IAB Cardy./2 Barkhausen JU16PS , a funct of the process, etc. it is shown that the only physiral characteristic which can be'found directly from the observed induced emf is the change in the dipole moment In 0 Which is proportional to the tine integral of thic induced emf- It follows that it is desirable to include an electronic integrator in the usual apparatus employed to measure the Barkhausen effect. A formula is obtained (Eq 21) which expresses the emf induced in the measuring coil as a function of the change in the magnetic dipole moment of a region in a ferromagnetic cylinder at an arbitrary distance from its axis. The formula is similar to that obtained by Tabble et al (Ref 3) but its derivation is more rigorous. The theoretical calculations are compared With published experimental results* There are 12 figures and 11 references, 8 of which are Soviet, I German and 2 English,' S/126/6o/oog/o6/015/025 Dynamics of the Barkhausen Jump E073/E335 nickel specimens for pulses of durations between 2 and 30 jLs. The analysis of the results of this experiment published in earlier work (Ref 2) leads to the conclusion that the real durations of the jumps did not exceed I Its. Evaluation by means of Eq (14) of this paper for an .equal specimen yiblds time values which are not contra- dictory to these conclusions. There are 3 figmres and 8 references, 3 of which are English, 2 French, 1 German and 2 Soviet. ASSOCIATION: Institut fiziki thf-ke --SC 0 USSR) SUBMITTED: December 15, 1959 AN SSSR (Institute of Physics of V/8 Card 2/2 W98 S/056/60/039/005/015/051 B029/BO79 141 Sbo AUTHORS: Kirenskiy, L. V., Ignatchenko, V. A.t Rodichem, A. M1. TITLE: The Behavior of a Domain Structure Under the Influence of Elastic Tensions PERIODICAL: Zhurnal eksperimentallnoy i tooretichoskoy fiziki, 1960, Vol. 39, No. 501), pp. 1263-126a TEXT: Using a thermodynamic method devised by L. D. Landau and Ye. M. Lifshits the authors studied an iron-type #iyatallite whose surface ' coincided with the (001) plane. They ass-- .the existence of partially overlapping domains whose width can assume values between 0 and D (D denotes the width of the principal domains). In this paper, the free energy of such a structure is calculated. The coordinates are assumed to coincide with the tetragonal axes of the cry3tallite, and the dimensions of the orystallite along the coordinates &.re denoted by xdyo,zo. 'Using the method of Ch. Kittel.(Ref. 2) for the calculation of the energy of the i' C~ cos (2in - 1) ak magnet. poles, one obtains WD Irr, Its 1,05+ (2m - 1)3 Car d - 1 /5 86898 The Behavior of e Domain Structure Under the S/05 60/039/005/015/051 Influence of Elastic Tensions B029YB079 where W denotes the surface density of the magnet poles. Moreover, k - d/D. f(k), that is, the expansion appearing in the brackets of (1,I) was calculated by means of the tables compiled-by K. A. Kitover (Ref. 11). Por estimatbs, f(k) - 5.280- 6.84k2 + 2.1 for k,