CN106556807A - Magnetic resistance static characteristic optimization method based on internal bias field and sensing direction - Google Patents

Magnetic resistance static characteristic optimization method based on internal bias field and sensing direction Download PDF

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CN106556807A
CN106556807A CN201611024079.7A CN201611024079A CN106556807A CN 106556807 A CN106556807 A CN 106556807A CN 201611024079 A CN201611024079 A CN 201611024079A CN 106556807 A CN106556807 A CN 106556807A
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field
bias
magnetic
hard axis
sensing direction
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CN106556807B (en
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胡军
欧阳勇
何金良
王善祥
赵根
王中旭
曾嵘
庄池杰
张波
余占清
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Tsinghua University
Sichuan Energy Internet Research Institute EIRI Tsinghua University
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Tsinghua University
Sichuan Energy Internet Research Institute EIRI Tsinghua University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/09—Magnetoresistive devices
    • G01R33/098—Magnetoresistive devices comprising tunnel junctions, e.g. tunnel magnetoresistance sensors

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  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

The present invention relates to static nature optimisation technique field, discloses a kind of magnetic resistance static characteristic optimization method based on internal bias field and sensing direction.Specifically include following steps：Easy axle bias-field, hard axis bias-field are set to into steady state value, the relation curve of absolute error and magnetic-field measurement scope when setting up different sensing directions；Different hard axis bias-fields are chosen, keeps hard axis bias-field constant, the relation curve of easy axle bias-field and optimal sensing direction in the case that acquisition hard axis bias-field is constant；Different hard axis bias-fields are chosen, is set up with easy axle bias-field, the three-dimensional coordinate of hard axis bias axis and optimal sensing direction as variable, under arbitrary easy axle bias-field and hard axis bias-field, make absolute error minimum optimal sensing direction can be obtained according to three-dimensional coordinate.Easy axle bias-field, hard axis bias axis and optimal sensing direction can be adjusted simultaneously, obtain the bigger range of linearity.

Description

Magnetic resistance static characteristic optimization method based on internal bias field and sensing direction
Technical field
It is the present invention relates to static nature optimisation technique field, particularly a kind of based on internal bias field and the magnetic of sensing direction Resistance static characteristic optimization method.
Background technology
In tunnel magneto chip development process, impact of the certainty of measurement to chip is extremely important.Static linear characteristic is tunnel One of the key property of magnetoresistive chip in linear measurement is worn, so needing by adjusting internal bias field to reduce non-linear mistake Difference, and then improve certainty of measurement.
Due to the limitation of processing technology, inside tunnel magneto, the magnetostatic lotus of ferromagnetic layer and Neel are coupling on hard axis direction Generate a big layer coupling energy, some situations even result in the absolute value of hard axis bias-field more than 1 and electric bridge chip without The preferable range of linearity.Therefore, it can increase the range of linearity and the linearity of electric bridge chip by applying bias-field in easy axle, reach To ideal effect.
So will effectively reduce nonlinearity erron can adjust many parameters, certainty of measurement is improved with this.
The content of the invention
The technical problem to be solved is：For above-mentioned problem, there is provided a kind of to be based on internal bias Field and the magnetic resistance static characteristic optimization method of sensing direction.
The technical solution used in the present invention is as follows：A kind of magnetic resistance static characteristic based on internal bias field and sensing direction is excellent Change method, specifically includes following steps：
Step 1, the easy axle bias-field of setting, hard axis bias-field and sensing direction are particular value, according to the output letter of sensor Number obtains the sensing curve of change rate of magnetic reluctance and normalization magnetic field dependence on two-dimensional coordinate；
Step 2, the maximum h for choosing specific magnetic-field measurement scopeFM, curve will be sensed through object functionOptimization, wherein, f (hF) for the output function of electric bridge chip, hFFor external magnetic field, hFM For the maximum of magnetic-field measurement scope, k, b sensitivity and biasing for chip, sensitivity k, biasing b and absolute error are obtained Err；
Step 3, the maximum h for choosing different magnetic-field measurement scopesFM, repeat step 2, the current easily axle bias-field of acquisition, The relation of absolute error Err, sensitivity k, biasing b and magnetic-field measurement scope under hard axis bias-field and sensing direction value is bent Line；
Step 4, the value for choosing the different sensing directions of N-1, the N is the natural number more than 2, repeat step 1-3, Obtain the relation curve of N bars absolute error Err and magnetic-field measurement scope, N bars absolute error Err and magnetic-field measurement scope Relation curve in same two-dimensional coordinate, every absolute error Err different biography corresponding from the relation curve of magnetic-field measurement scope The value in sense direction；
Step 5, specific magnetic fields measurement range and specific easily axle bias-field, hard axis biasing are obtained according to the two-dimensional coordinate Off field so that the minimum optimal sensing direction of absolute error；
The different easy axle bias-fields of step 6, setting, holding hard axis bias-field are constant, and repeat step 1-5 obtains hard axis inclined Put field it is constant in the case of easily axle bias-field and optimal sensing direction relation curve；
Step 7, different hard axis bias-fields are set, repeat step 1-6, set up with easy axle bias-field, hard axis bias axis and Optimal sensing direction is the three-dimensional coordinate of variable, can be obtained in arbitrary easy axle bias-field and hard axis bias-field according to three-dimensional coordinate Under make absolute error minimum optimal sensing direction.
Further, in the step 1, output function is：
Wherein VSP, VSN, VOP, VONThe respectively positive-negative power of electric bridge chip and positive negative output；R1And R2First is represented respectively Tunnel magneto resistance and the second tunnel magneto；ΔmaxFor maximum magnetoresistive ratio；For the free layer magnetic of the first tunnel magneto Change direction,For the free layer direction of magnetization of the second tunnelling magnetic group.
Further, the detailed process of the step 2 is：
Step 21, maximum value of magnetic field h for choosing specific measurement rangeFM, it is-h to intercept magnetic-field measurement scopeFM～hFMBetween Sensing curve；
Step 22, the sensing curve lived after intercepting using two parallel lines envelopes, and cause between two parallel lines Distance it is minimum；
Parallel lines in the middle of step 23, two parallel lines is the target line after optimization, the target line Slope and intersection point respectively sensitivity k and biasing b with vertical coordinate；
Step 24, distance as absolute error Err of envelope straight line and target line in vertical coordinate intersection point is obtained, or by institute The value for stating sensitivity k and biasing b substitutes into object functionAcquire specific measurement Maximum value of magnetic field h of scopeFMUnder absolute error Err.
Compared with prior art, having the beneficial effect that using above-mentioned technical proposal：Set up hard axis bias-field, easy axle bias-field With the three-dimensional coordinate figure of optimal sensing direction, while the method for adjusting internal bias field and sensing direction parameter, obtains bigger The range of linearity；Any hard axis bias-field and the optimal sensing under easy axle bias-field can be obtained with simple, intuitive by three-dimensional coordinate Direction.
Description of the drawings
Fig. 1 is the structural representation of the electric bridge model for adopting.
Fig. 2 be free layer bias-field for (1, sensing curve analogous diagram when 0.5), when sensing direction is 90 °.
Fig. 3 be free layer bias-field for (1, when 0.5), absolute error and magnetic-field measurement scope in the case of different sensing directions Schematic diagram.
Fig. 4 is to fix easy axle to bias the optimal sensing direction for being with another axle offset change figure.
Fig. 5 is optimal sensing direction with free layer internal bias variation diagram.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described further.
As Figure 1-5, a kind of magnetic resistance static characteristic optimization method based on internal bias field and sensing direction, it is concrete to wrap Include following steps：
Step 1, the easy axle bias-field of setting, hard axis bias-field and sensing direction are particular value, according to the output letter of sensor Number obtains the sensing curve of change rate of magnetic reluctance and normalization magnetic field dependence on two-dimensional coordinate；
Step 2, the maximum h for choosing specific magnetic-field measurement scopeFM, curve will be sensed through object functionOptimization, wherein, f (hF) for the output function of electric bridge chip, hFFor external magnetic field, hFM For the maximum of magnetic-field measurement scope, k, b sensitivity and biasing for chip, sensitivity k, biasing b and absolute error are obtained Err；
Step 3, the maximum h for choosing different magnetic-field measurement scopesFM, repeat step 2, the current easily axle bias-field of acquisition, The relation of absolute error Err, sensitivity k, biasing b and magnetic-field measurement scope under hard axis bias-field and sensing direction value is bent Line；
Step 4, the value for choosing the different sensing directions of N-1, the N is the natural number more than 2, repeat step 1-3, Obtain the relation curve of N bars absolute error Err and magnetic-field measurement scope, N bars absolute error Err and magnetic-field measurement scope Relation curve in same two-dimensional coordinate, every absolute error Err different biography corresponding from the relation curve of magnetic-field measurement scope The value in sense direction；
Step 5, specific magnetic fields measurement range and specific easily axle bias-field, hard axis biasing are obtained according to the two-dimensional coordinate Off field so that the minimum optimal sensing direction of absolute error；
The different easy axle bias-fields of step 6, setting, holding hard axis bias-field are constant, and repeat step 1-5 obtains hard axis inclined Put field it is constant in the case of easily axle bias-field and optimal sensing direction relation curve；
Step 7, different hard axis bias-fields are set, repeat step 1-6, set up with easy axle bias-field, hard axis bias axis and Optimal sensing direction is the three-dimensional coordinate of variable, can be obtained in arbitrary easy axle bias-field and hard axis bias-field according to three-dimensional coordinate Under make absolute error minimum optimal sensing direction.
The electric bridge model of employing is illustrated in figure 1, founding mathematical models are:
Wherein hBFRepresent the internal bias field normalizing value of free layer, hFNormalizing value of the external magnetic field in each layer is represented,For The free layer direction of magnetization of the first tunnel magneto,For the free layer direction of magnetization of the second tunnelling magnetic group；θBFFor in free layer Portion bias magnetic field direction, sensing directions of the θ for external magnetic field, tunnel magneto resistance and free layer, the pass of the reference layer direction of magnetization It is to be Wherein R1And R2The first tunnelling is represented respectively Magnetic resistance resistance and the second tunnel magneto, ΔmaxFor maximum magnetoresistive ratio, RavgFor average resistance, setting up output function isWherein VSP, VSN, VOP, VONRespectively electric bridge chip Positive-negative power and positive negative output.
The embodiment of sensing direction θ=90 °：1 is taken with easy axle bias-field, hard axis bias-field is taken as a example by 0.5, according to output letter Number, obtains the sensing curve of change rate of magnetic reluctance and normalization magnetic field dependence, block curve in such as Fig. 2 on two-dimensional coordinate.
Carry out the detailed process of step 2：Choose the maximum h of specific magnetic-field measurement scopeFM, intercept magnetic-field measurement scope For-hFM～hFMBetween sensing curve, this enforcement row in hFM2 are taken, the solid line in curve such as Fig. 2 is sensed；Using two parallel lines The sensing curve that envelope is lived after intercepting, and cause the distance in the middle of two parallel lines minimum, two parallel lines such as figure Two dotted lines of middle both sides；Parallel lines between two parallel lines be optimization after target line, the target line Slope and be respectively sensitivity k with the intersection point of vertical coordinate and bias b；Envelope straight line is obtained with target line in vertical coordinate intersection point Distance be absolute error Err, or by the sensitivity k and biasing b value substitute into object functionAcquire the maximum h of specific magnetic-field measurement scopeFMFor the absolute mistake under 2 Difference Err.
Choose the maximum h of different magnetic-field measurement scopesFM, now easily axle is biased to 1, when hard axis is biased to 0.5, sensing Direction is 90 °, repeat step 2, and in the case of the constant easy axle bias-field of acquisition is 1 and hard axis is biased to field 0.5, sensing direction is The relation curve of absolute error Err and magnetic-field measurement scope, the curve 3 in such as Fig. 3 when 90 °；
The value of different hard axis bias-fields, including 70 ° are chosen, 80 °, 100 °, 110 °, repeat step 1-3 obtains 5 The relation curve of absolute error Err and magnetic-field measurement scope, 5 absolute errors Err are bent with the relation of magnetic-field measurement scope Line is in same two-dimensional coordinate；Now easily axle is biased to 1, and hard axis is biased to 0.5, every absolute error Err and magnetic-field measurement model The value of the corresponding different sensing direction of relation curve for enclosing, including 70 °, 80 °, 90 °, 100 °, 110 °, corresponded in Fig. 3 respectively Curve 1, curve 2, curve 3, curve 4 and curve 5.
Being obtained according to the two-dimensional coordinate makes under specific magnetic fields measurement range and specific hard axis bias-field, easy axle bias-field Obtain the minimum sensing direction analog value of absolute error.Any one magnetic-field measurement scope correspondence can be searched from two-dimensional coordinate minimum Sensing direction value during absolute error.
Different easy axle bias-fields are set, keep hard axis bias-field constant 0.5, repeat step 1-5 to obtain hard axis bias-field The relation curve of easy axle bias-field and optimal sensing direction in the case of constant, as shown in Figure 4 with the curve of circle remittance abroad, now Can see, when hard axis bias-field is 0.5, optimal sensing direction angle reduces with easy axle biasing increase.
Different hard axis bias-fields are set, and repeat step 1-6 is set up with easy axle bias-field, hard axis bias axis and optimal biography Sense direction is the three-dimensional coordinate of variable, as described in Figure 5, can obtain inclined in arbitrary easy axle bias-field and hard axis according to three-dimensional coordinate Put the optimal sensing direction for making absolute error minimum off field.
The invention is not limited in aforesaid specific embodiment.The present invention is expanded to and any is disclosed in this manual New feature or any new combination, and the arbitrary new method that discloses or the step of process or any new combination.If this Art personnel, the unsubstantiality done in the spirit without departing from the present invention are altered or modified, and should all belong to power of the present invention The claimed scope of profit.

Claims (3)

1. a kind of magnetic resistance static characteristic optimization method based on internal bias field and sensing direction, it is characterised in that including following Step：
Step 1, the easy axle bias-field of setting, hard axis bias-field and sensing direction are particular value, are existed according to the output function of sensor The sensing curve of change rate of magnetic reluctance and normalization magnetic field dependence is obtained on two-dimensional coordinate；
Step 2, the maximum h for choosing specific magnetic-field measurement scopeFM, curve will be sensed through object functionOptimization, wherein, f (hF) for the output function of electric bridge chip, hFFor external magnetic field, hFM For the maximum of magnetic-field measurement scope, k, b sensitivity and biasing for chip, sensitivity k, biasing b and absolute error are obtained Err；
Step 3, the maximum h for choosing different magnetic-field measurement scopesFM, repeat step 2, acquisition current easily axle bias-field, hard axis The relation curve of absolute error Err, sensitivity k, biasing b and magnetic-field measurement scope under bias-field and sensing direction value；
Step 4, the value for choosing the different sensing directions of N-1, the N is the natural number more than 2, and repeat step 1-3 is obtained The relation of the relation curve of N bars absolute error Err and magnetic-field measurement scope, N bars absolute error Err and magnetic-field measurement scope Curve in same two-dimensional coordinate, every absolute error Err different sensing side corresponding from the relation curve of magnetic-field measurement scope To value；
Step 5, obtained according to the two-dimensional coordinate under specific magnetic fields measurement range and specific easily axle bias-field, hard axis bias-field So that the minimum optimal sensing direction of absolute error；
The different hard axis bias-fields of step 6, setting, the easy axle bias-field of holding are constant, and repeat step 1-5 obtains easy axle bias-field The relation curve of hard axis bias-field and optimal sensing direction in the case of constant；
Step 7, different easy axle bias-fields are set, repeat step 1-6 is set up with easy axle bias-field, hard axis bias axis and optimal Three-dimensional coordinate of the sensing direction for variable, can be obtained according to three-dimensional coordinate makes under arbitrary easy axle bias-field and hard axis bias-field The minimum optimal sensing direction of absolute error.
2. the magnetic resistance static characteristic optimization method based on internal bias field and sensing direction as claimed in claim 1, its feature It is that output function is in the step 1：
Wherein VSP, VSN, VOP, VONThe respectively positive-negative power of electric bridge chip and positive negative output；R1And R2The first tunnelling is represented respectively Magnetic resistance resistance and the second tunnel magneto；ΔmaxFor maximum magnetoresistive ratio；For the free layer magnetization side of the first tunnel magneto To,For the free layer direction of magnetization of the second tunnelling magnetic group.
3. the magnetic resistance static characteristic optimization method based on internal bias field and sensing direction as claimed in claim 2, its feature It is that the detailed process of the step 2 is：
Step 21, maximum value of magnetic field h for choosing specific measurement rangeFM, it is-h to intercept magnetic-field measurement scopeFM～hFMBetween biography Sense curve；
Step 22, firmly intercepted using two parallel lines envelopes after sensing curve, and cause between two parallel lines away from From minimum；
Parallel lines in the middle of step 23, two parallel lines be optimization after target line, the slope of the target line And sensitivity k and biasing b is respectively with the intersection point of vertical coordinate；
Step 24, distance as absolute error Err of envelope straight line and target line in vertical coordinate intersection point is obtained, or by the spirit The value of sensitivity k and biasing b substitutes into object functionAcquire specific measurement range Maximum value of magnetic field hFMUnder absolute error Err.
CN201611024079.7A 2016-11-18 2016-11-18 Magnetic resistance static characteristic optimization method based on internal bias field and sensing direction Active CN106556807B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN110749847A (en) * 2019-10-14 2020-02-04 清华大学 Method for determining optimal direct-current bias magnetic field value based on direct-current bias magnetic field

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Publication number Priority date Publication date Assignee Title
CN110749847A (en) * 2019-10-14 2020-02-04 清华大学 Method for determining optimal direct-current bias magnetic field value based on direct-current bias magnetic field
CN110749847B (en) * 2019-10-14 2021-11-12 清华大学 Method for determining optimal direct-current bias magnetic field value based on direct-current bias magnetic field

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